Full opinion text
Affirmed in part and dismissed in part by published opinion. Judge KING wrote the opinion, in which Judge WILKINSON and Judge GOODWIN joined. OPINION KING, Circuit Judge: In March of 1992, wealthy art collector and notorious philanderer Roger de la Burde died from a single gunshot wound to the head. Following a high-profile trial in Powhatan County, Virginia, his longtime girlfriend Beverly Monroe was convicted of his murder. Monroe later discovered a wealth of exculpatory evidence that the prosecution had suppressed, including impeachment material, leads implicating other suspects, official documents labeling Burde’s death a suicide, and statements suggesting that Burde may have been suicidal. On the basis of this new information, Monroe claimed that the prosecution had violated her due process rights, pursuant to the principles established by Brady v. Maryland, 373 U.S. 83, 83 S.Ct. 1194, 10 L.Ed.2d 215 (1963). After unsuccessful state court proceedings, Monroe petitioned for a writ of habeas corpus in the Eastern District of Virginia. Following discovery in the federal proceedings, the district court granted the writ, concluding that the prosecution had suppressed material, exculpatory evidence. Monroe v. Angelone, No. 3:98CV254, Memorandum Opinion (E.D.Va. Mar. 28, 2002) (the “Habeas Opinion”). The Commonwealth has appealed the court’s award of habeas corpus relief, and Monroe has cross-appealed, challenging the court’s conclusion that she procedurally defaulted certain aspects of her Brady claim. Because the Brady evidence on which the court relied is sufficient to warrant its award of habeas corpus relief, we affirm without deciding the procedural default issue. This murder prosecution was closely contested, and the Commonwealth’s evidence of premeditation and malice, essential elements of first-degree murder in Virginia, was particularly sparse. In attempting to portray Monroe as a coldblooded, calculating killer, the Commonwealth relied primarily on the testimony of Zelma Smith, who told the jury that Monroe sought to obtain an untraceable handgun about a year before Burde’s death. Significantly, the Commonwealth suppressed several evidentiary items that would have severely damaged the credibility of this crucial witness. The suppression of this Brady evidence undermines our confidence in the verdict, and there is a reasonable probability that, had the prosecution properly disclosed exculpatory material, the jury would not have convicted Monroe of first-degree murder. I. A. In the early morning hours of March 5, 1992, Monroe and Joe Hairfield, Burde’s groundskeeper, discovered Burde’s body lying on a couch in the main house of his Powhatan County estate. Burde had died from a single gunshot wound to his forehead, the shot having been fired from his own handgun. The Powhatan County Sheriffs Office and Medical Examiner originally treated Burde’s death as a suicide, and very little evidence was collected from the scene. The State Police, however, soon began to suspect foul play, and the ensuing investigation focused exclusively on Monroe. During his lifetime, Burde held himself out as descended from Polish royalty, and he had gained notoriety for his rumored wealth, his art collection, and his promiscuity. He was reputed to be a ruthless businessman who had amassed a substantial fortune through unorthodox business deals. He had worked for a number of years as a chemist at Philip Morris Incorporated (“Philip Morris”), but after the company forced him into retirement, he concentrated on his real estate investments and his collection of African art. As part of his livelihood, Burde ran a horse farm on his sprawling estate, which was known to local residents as “Windsor.” Monroe had been involved in a romantic relationship with Burde for approximately thirteen years before his death, and she had been with him on the evening of March 4, 1992. Although Burde had affairs with other women, Monroe had been his primary girlfriend in the years prior to his death. In 1992, Monroe was fifty-four years old. She held a masters degree in organic chemistry, and she had been employed for more than ten years in the patent department of Philip Morris. Monroe had close relationships with her three children, whom she had raised after her 1981 separation (and subsequent divorce) from Stuart Monroe. In 1992, Beverly Monroe lived with her adult son, Gavin, approximately thirteen miles from Windsor, and her daughters, Shannon and Katie, visited frequently. B. 1. At Monroe’s trial in the Circuit Court of Powhatan County, the Commonwealth introduced evidence that Burde had affairs with other women, that Monroe stood to gain financially from Burde’s death, and that Monroe had made inconsistent statements about whether she was present when Burde committed suicide. Further, the Commonwealth offered the testimony of Smith, a multiple felon, who stated that ten months prior to Burde’s death, Monroe, identifying herself as “Ms. Nelson,” had offered her $800 for an untraceable handgun. The Commonwealth also sought to establish that Burde was upbeat and happy prior to his death and would not have committed suicide. Finally, the Commonwealth presented forensic evidence suggesting that it was unlikely that Burde had shot himself. In her defense, Monroe presented two alternate explanations of Burde’s death, both of which supported her acquittal. First, she sought to show that Burde had committed suicide. Along these lines, witnesses testified to his precarious mental state, describing him as narcissistic and controlling, cruel and abusive to those around him, prone to obsessive and paranoid behavior, and depressed in the weeks and months prior to his death. The evidence showed that Burde’s mother had attempted suicide and that Burde himself had discussed suicide in the past. Furthermore, Monroe contended that Burde had reason to be suicidal. For example, he was in danger of being exposed as a fraud in his art dealings, and he was worried about his health. Second, Monroe attempted to show that Burde had many enemies, any one of whom could have killed him. The list of potential suspects included his jilted girlfriends, their husbands, and Burde’s children. In addition to offering alternate explanations for Burde’s death, Monroe sought to convince the jury that she was incapable of committing the murder. She testified in her own defense, maintaining that she had not been present when Burde died and that any of her statements to the contrary had been coerced. According to Monroe, she loved Burde, accepted his imperfections, and would never have killed him. Indeed, Monroe was, by all accounts, a calm, gentle, and kind person, and she had an impeccable reputation as an honest and law-abiding citizen. According to numerous witnesses, she had been distraught in the weeks and months following Burde’s death. Monroe also presented the jury with alibi evidence, in the form of a receipt and a neutral eyewitness, placing her in a grocery store miles from Windsor around the time of Burde’s death. On November 2, 1992, after a seven-day trial, the jury convicted Monroe of first-degree murder and use of a firearm in the commission of a felony. On December 22, 1992, she was sentenced to twenty years in prison for the murder conviction and an additional two years for the firearm conviction. 2. On direct appeal to the Court of Appeals of Virginia, Monroe primarily contended that her statements to authorities were admitted at trial in violation of her Fifth and Sixth Amendment rights. Among other claims, she maintained that the trial court erred in admitting the testimony of Zelma Smith because the prosecution had violated its obligations under Brady v. Maryland, 373 U.S. 83, 83 S.Ct. 1194, 10 L.Ed.2d 215 (1963), when it failed to disclose material that would have undermined Smith’s credibility. On this point, Monroe asserted that the prosecution had withheld evidence that it had agreed not to prosecute Smith on a firearms offense in exchange for her testimony against Monroe (the “Smith gun deal”). On May 2, 1995, the Court of Appeals affirmed Monroe’s conviction, concluding, inter alia, that the prosecution’s suppression of the Smith gun deal was immaterial. Monroe v. Virginia, 1995 WL 250986, No. 2604-92-2, Memorandum Opinion (Va.Ct. App. May 2, 1995) (“Monroe I”). Six months later, in a summary opinion issued on November 1, 1995, the Supreme Court of Virginia refused to grant Monroe’s petition for appeal. Monroe v. Virginia, No. 951346 (Va. Nov. 1, 1995). 3. On April 7, 1997, after an unsuccessful direct appeals process, Monroe filed a ha-beas corpus petition in the Supreme Court of Virginia, raising numerous challenges to her conviction. First, she contended that she had received ineffective assistance of counsel. Second, she asserted, once again, that her statements to the authorities had been introduced in violation of Miranda and her Sixth Amendment right to counsel. Finally, she maintained that her conviction had been obtained in violation of her due process rights, because of a tainted investigation, prosecutorial misconduct, and the Commonwealth’s violation of Brady by its suppression of exculpatory evidence. In support of her Brady claim, Monroe pointed to nine separate items of suppressed, exculpatory material: (1) the Smith gun deal; (2) the Commonwealth’s agreement to help Smith obtain a reduction of an unrelated sentence (the “Smith sentence deal”); (3) Smith’s history as an informant (“Smith’s informant history”); (4) the identity of witnesses who had seen a dark Bronco/Blazer vehicle speeding from Windsor around the time of Burde’s death (the “Bronco witnesses”); (5) the full results of gunshot residue tests (the “residue tests”); (6) the medical records of Krystyna Drewnowska (“Krystyna”), one of Burde’s girlfriends, who was pregnant with his child when he died (“Krystyna’s medical records”); (7) a statement by Windsor groundskeeper Joe Hairfield that he had moved the gun when he found Burde’s body (“Hairfield’s statement”); (8) a medical examiner’s report (the “missing examiner’s report”); and (9) the source of a letter written by Monroe and used to pressure her in a pre-trial police interview (the “inculpatory letter source”). On October 29, 1997, Monroe moved in the Supreme Court of Virginia for discovery to search for other exculpatory material that the prosecution may have suppressed. Further, on November 20, 1997, Monroe sought to amend her state habeas corpus petition to include claims based on evidence she had discovered through an independent investigation. In particular, Monroe had obtained evidence that the Commonwealth had suppressed three other items of exculpatory material: (1) a March 5, 1992, report made by Dr. Brown of the Medical Examiner’s office, which indicated that, based on his examination of Burde’s body at Windsor, he concluded that Burde’s death was a suicide (“Dr. Brown’s first report”); (2) a laboratory request made by Dr. Jefferson, the physician in the Medical Examiner’s office who conducted Burde’s autopsy, labeling Burde’s death a suicide (“Dr. Jefferson’s notes”); and (3) evidence that Burde’s ex-wife, Dr. Brigitte Burde, had advised the Medical Examiner’s office that Burde had been experiencing personal problems and taking Librium, an anti-depressant medication (the “anti-depressant disclosure”). These items came to light through a Freedom of Information Act request to the Powhatan County Medical Examiner after the conclusion of Monroe’s trial (the “FOIA request”). In its order of January 29, 1998, the Supreme Court of Virginia dismissed Monroe’s habeas corpus petition and refused, without explanation, to authorize either additional discovery or Monroe’s proposed amendment. Monroe v. Dir. of the Dep’t of Corr., No. 970666 (Va. Jan. 29, 1998) (“Monroe II ”). In dismissing the petition, the court ruled that most of Monroe’s claims had been defaulted, pursuant to Slayton v. Parrigan, 215 Va. 27, 205 S.E.2d 680 (1974), because they had not been raised at the earliest opportunity. As for the claims Monroe had preserved, the court ruled that Monroe was not entitled to any relief. 4. On April 27, 1998, following her unsuccessful state proceedings, Monroe sought habeas corpus relief in the Eastern District of Virginia. Her federal petition largely reiterated the claims she had asserted in her petition to the Supreme Court of Virginia, although she no longer relied, at least for the purposes of her Brady claim, either on the Commonwealth’s failure to disclose Krystyna’s medical records or on the inculpatory letter source. She also replaced the missing examiner’s report with Dr. Brown’s first report. Furthermore, her federal petition included other material obtained through the FOIA request, specifically Dr. Jefferson’s notes and the anti-depressant disclosure. In response, the Commonwealth moved to dismiss her petition, asserting that, under the principles of Slayton, Monroe had proeedurally defaulted most of her claims. On April 26, 1999, the district court dismissed certain aspects of Monroe’s Brady claim, agreeing with the Commonwealth that they had been defaulted. Monroe v. Angelone, No. 3:98CV254, Memorandum (E.D.Va. Apr. 26, 1999) (the “Default Opinion”). In particular, the court concluded that Monroe had defaulted her right to rely on the following exculpatory material: (1) Dr. Brown’s first report; (2) Dr. Jefferson’s notes; (3) the anti-depressant disclosure; (4) the residue tests; and (5) Hair-field’s statement. Id. at 9-20. The court also ruled, however, that Monroe was entitled to rely on other Brady evidence, including: (1) the Smith gun deal; (2) the Smith sentence deal; (3) Smith’s informant history; and (4) the Bronco witnesses. Id. at 20. In its Default Opinion, the court also granted Monroe’s motion for discovery with respect to her remaining claims. Id. at 21-26. Over the next year, from April of 1999 until July of 2000, Monroe conducted discovery in search of additional Brady material. As part of this effort, she deposed Smith; Deputy Sheriff Gregory Neal of the Powhatan County Sheriffs Office; Special Agent David Riley of the Virginia State Police; Corinna de la Burde Pugh (“Corinna”), Burde’s youngest daughter; Deborah Pollock, a secretary in the Sheriffs Office who had observed some part of Riley’s interview of Monroe on March 26, 1992; and Patricia Dilettoso Fisher, another secretary who had observed the same interview. These discovery efforts revealed three other categories of suppressed, exculpatory evidence. First, the prosecution had failed to provide Monroe’s defense with some of Riley’s notes on Smith (“Riley’s notes”). Riley’s notes established that the Commonwealth knew of, but withheld, evidence of Smith’s history as an informant. The notes also revealed that Smith had made statements inconsistent with her trial testimony (“Smith’s inconsistent statements”), and that Smith had advised Riley that her former employer, Eric Lundy, had provided her with the handgun she offered to sell to Monroe (the “Lundy information”). Strikingly, Riley did not contact or interview Lundy because, according to Riley, he assumed that Lundy would deny Smith’s allegations and contradict her testimony. Lundy’s denial, however, would have supported Monroe’s defense by impeaching Smith’s credibility. Second, Monroe found that the prosecution had failed to disclose Deputy Neal’s notes regarding certain statements made by prosecution witnesses. These included: (1) a statement by Barbara Samuels, Burde’s secretary, that “the recent past had been hard for Burde due to personal problems” (“Samuels’s personal problems statement”); (2) Samuels’s statement that Burde’s usual napping position was “on his back with his hands on his head” and that he always napped on the sofa opposite from the one on which he was found (“Samu-els’s napping habits statement”); and (3) Corinna’s statement that Krystyna was afraid to take a test to determine the sex of her baby because Burde would not want a baby girl (“Corinna’s male heir statement”). Deputy Neal had taken each of these statements in the days following Burde’s death, and they support the proposition that Burde was killed either by his own hand or by someone other than Monroe. Finally, Monroe discovered that the Commonwealth had failed to disclose notes taken by two secretaries who watched Riley interview Monroe on March 26, 1992 (the “secretaries’ notes”). During the interview, Riley questioned Monroe about the evening of Burde’s death, eventually leading her to acknowledge a vague recollection of being present when Burde committed suicide. Riley did not record this interview, but he had two secretaries, Ms. Pollock and Ms. Dilettoso, take notes from an observation room behind a one-way mirror. The secretaries’ notes corroborate Monroe’s testimony that Riley had manipulated her, and they would have been helpful to Monroe’s defense in cross-examining prosecution witnesses who testified about the interview. On June 27, 2000, the district court referred Monroe’s petition to a magistrate judge, pursuant to 28 U.S.C. § 636(b), “for all purposes, including the handling of all pretrial motions, and for an evidentiary hearing if necessary.” Monroe v. Angelone, No. 3:98CV254, Order (E.D. Va. June 27, 2000). Soon thereafter, Monroe successfully moved to amend her petition to include the new information obtained during discovery. In response, the Commonwealth moved for summary judgment, and Monroe filed a cross-motion for summary judgment and an opposition to the Commonwealth’s motion. In December of 2000, the magistrate judge conducted a two-day hearing on Monroe’s petition. On April 18, 2001, he issued his Report and Recommendation to the district court, recommending that Monroe’s petition be denied. Monroe v. Angelone, No. 3:98CV254, Magistrate’s Report and Recommendation (E.D. Va. April 18, 2001) (the “Report”). Monroe filed timely objections to the Report, urging the court to reject the magistrate judge’s recommendation and to issue a writ. On September 17, 2001, the court conducted a hearing on Monroe’s objections to the Report, and it issued its Habeas Opinion on March 28, 2002. In the Habeas Opinion, the court awarded Monroe a writ of habeas corpus because of the prosecution’s failure to disclose exculpatory evidence, including: (1) the Smith gun deal; (2) the Smith sentence deal; (3) Smith’s informant history; (4) Smith’s inconsistent statements; (5) the Lundy information; (6) Samuels’s personal problems statement; (7) Samuels’s napping habits statement; (8) Corinna’s male heir statement; (9) the secretaries’ notes; and (10) the Bronco witnesses. Habeas Opinion at 48-62. In assessing the collective effect of the prosecution’s suppression of this evidence, as it was required to do by the Supreme Court’s decision in Kyles v. Whitley, 514 U.S. 419, 115 S.Ct. 1555, 131 L.Ed.2d 490 (1995), the court concluded that the Commonwealth had violated established Brady principles. Habeas Opinion at 60-62. After granting Monroe a writ of habeas corpus, the court stayed its order pending appeal and released Monroe on bond. The Commonwealth has filed a timely notice of appeal from the Habeas Opinion, and Monroe has cross-appealed. We possess jurisdiction over the court’s decision to award habeas corpus relief pursuant to 28 U.S.C. § 1291. II. A. In its appeal, the Commonwealth maintains that the district court failed to give proper deference to the state court adjudications of Monroe’s Brady claim, as required by the Antiterrorism and Effective Death Penalty Act of 1996 (“AED-PA”). Under AEDPA, a federal court must defer to a state court’s resolution of a claim that has been “adjudicated on the merits.” 28 U.S.C. § 2254(d). Conversely, where a state court has not considered a properly preserved claim on its merits, a federal court must assess the claim de novo. Daniels v. Lee, 316 F.3d 477, 487 (4th Cir.2003); see also Cargle v. Mullin, 317 F.3d 1196, 1206 (10th Cir.2003) (“[AEDPA] applies only when there is an antecedent state court decision on the same matter.”). Pursuant to this doctrine, AED-PA’s deference requirement does not apply when a claim made on federal habeas review is premised on Brady material that has surfaced for the first time during federal proceedings. Rojem v. Gibson, 245 F.3d 1130, 1140 (10th Cir.2001) (reviewing Brady claim de novo when exculpatory material surfaced for first time in federal habeas proceedings); Williams v. Coyle, 260 F.3d 684, 706 (6th Cir.2001), cert. denied, 536 U.S. 947, 122 S.Ct. 2635, 153 L.Ed.2d 816 (2002) (same); see also Car- gle, 317 F.3d at 1206-07 (holding that AEDPA’s standard of review does not apply when new issues are considered on federal habeas review); Daniels, 316 F.3d at 487 (suggesting that when “evidence on which [a federal claim] is premised was only discovered [after the conclusion of state court proceedings,] it does not trigger the deference mandate of AEDPA”); Killian v. Poole, 282 F.3d 1204, 1208 (9th Cir.2002) (“AEDPA deference does not apply to [a] claim [when] [e]vidence of the [claim] was adduced only at the hearing before the [federal] magistrate judge.”). Here, certain items of suppressed, exculpatory material first came to light during Monroe’s federal habeas proceedings. In particular, Monroe first obtained the following through discovery in federal court: (1) some evidentiary material on the Smith sentence deal (particularly Riley’s deposition); (2) some evidentiary material on Smith’s informant history (particularly information in Riley’s notes); (3) Smith’s inconsistent statements; (4) the Lundy information; (5) Samuels’s personal problems statement; (6) Samuels’s napping habits statement; (7) Corinna’s male heir statement; and (8) the secretaries’ notes. By contrast, the state courts have previously considered: (1) the Smith gun deal; (2) some evidentiary material on the Smith sentence deal; (3) some evidentiary material on Smith’s informant history; and (4) the Bronco witnesses. In these circumstances, we are obliged to give deference to decisions of the state courts that the Commonwealth’s failure to disclose these last four items of Brady evidence did not constitute a Brady violation. The prosecution’s late disclosure of the other eight items of exculpatory material listed above, however, precluded the state courts from considering those items when they ruled on Monroe’s Brady claim. Because no state court was ever presented with these eight items of exculpatory material, we are obliged to make an independent determination of whether they are favorable to Monroe, and whether they were suppressed. Daniels, 316 F.3d at 487; see also Boyette v. Lefevre, 246 F.3d 76, 89 (2d Cir.2001) (“[B]ecause no state court determined whether some documents were Brady materials, we must exercise de novo review of this issue.”). In addition, we must determine whether all of the non-defaulted materials — those presented in state court and those presented for the first time in federal court — considered and weighed collectively, made a material difference to the outcome of Monroe’s trial. Kyles, 514 U.S. at 436-37, 115 S.Ct. 1555; Cargle, 317 F.3d at 1206-07. In making this “materiality” determination, the third step in any Brady analysis, we are unable to accord AEDPA deference on an item-by-item basis to the four items of exculpatory material considered in state court, because we are obliged to assess the materiality of exculpatory evidence “collectively, not item by item.” Kyles, 514 U.S. at 436, 115 S.Ct. 1555; see also Cargle, 317 F.3d at 1206-07 (holding that AEDPA does not apply to cumulative error analysis when no state court has considered all the material considered by federal courts). In these circumstances, we have no way of deferring to an earlier state court adjudication on materiality because no state court considered all of the Brady material presented here. As a result, we must make an independent assessment of whether the suppression of exculpatory evidence — including the evidence previously presented to the state courts— materially affected Monroe’s first-degree murder conviction. B. In our consideration of the district court’s judgment, we review legal conclusions de novo and findings of fact for clear error. See Quesinberry v. Taylor, 162 F.3d 273, 276 (4th Cir.1998). Although the magistrate judge, rather than the district court, conducted the evidentiary hearing on Monroe’s petition, we review the district court’s findings, rather than the magistrate judge’s recommendations. LoConte v. Dugger, 847 F.2d 745, 750 (11th Cir.1988); see also Wimmer v. Cook, 774 F.2d 68, 73 (4th Cir.1985) (“[WJhile ... the magistrate may conduct the evidentiary hearing in the case, he lacks judicial authority to make on his own a final determination.”); cf. United States v. Raddatz, 447 U.S. 667, 683, 100 S.Ct. 2406, 65 L.Ed.2d 424 (1980) (holding that district court is ultimate decisionmaker). III. The prosecution’s failure to disclose evidence favorable to an accused “violates due process where the evidence is material either to guilt or to punishment, irrespective of the good faith or bad faith of the prosecution.” Brady, 373 U.S. at 87, 83 S.Ct. 1194. Moreover, the prosecutor’s duty encompasses both impeachment material and exculpatory evidence, and it includes material that is “known only to police investigators and not to the prosecutor.” Kyles, 514 U.S. at 438, 115 S.Ct. 1555. Along these lines, “the individual prosecutor has a duty to learn of any favorable evidence known to the others acting on the government’s behalf.” Id. at 437, 115 S.Ct. 1555. Significantly, a Brady violation has three essential elements: (1) the evidence must be favorable to the accused; (2) it must have been suppressed by the government, either willfully or inadvertently; and (3) the suppression must have been material, i.e., it must have prejudiced the defense at trial. Strickler v. Greene, 527 U.S. 263, 281-82, 119 S.Ct. 1936, 144 L.Ed.2d 286 (1999). As explained below, the suppressed evidence on which the district court relied in awarding habeas corpus relief establishes a Brady violation, which renders it unnecessary for us to reach the issue of procedural default raised by Monroe in her cross-appeal. To be clear, we are considering only the following evidence (the “Ha-beas Evidence”) in our assessment of Monroe’s Brady claim: (1) the Smith gun deal; (2) the Smith sentence deal; (3) Smith’s informant history; (4) Smith’s inconsistent statements; (5) the Lundy information; (6) Samuels’s personal problems statement; (7) Samuels’s napping habits statements; (8) Corinna’s male heir statement; (9) the secretaries’ notes; and (10) the Bronco witnesses. In light of the foregoing, we turn to whether the Habeas Evidence establishes the three essential elements of a Brady violation, as articulated by the Supreme Court in Strickler v. Greene. A. First, we agree with the district court that each item of Habeas Evidence was favorable to Monroe. Most, if not all, of the Habeas Evidence could have been used to impeach prosecution witnesses. In particular, the prosecution failed to disclose five separate items of impeachment material on its key witness, Zelma Smith, including: (1) the Smith gun deal; (2) the Smith sentence deal; (3) Smith’s informant history; (4) Smith’s inconsistent statements; and (5) the Lundy information. Similarly, the statements given to Deputy Neal — including Samu-els’s personal problems statement, Samu-els’s napping habits statement, and Corin-na’s male heir statement — could have been used to impeach other prosecution witnesses. Along similar lines, the secretaries’ notes would have been helpful in cross-examining prosecution witnesses who testified about the March 26, 1992, interview. Finally, the Bronco witnesses — had their identities been disclosed — could have been called to testify that they had observed a suspicious vehicle speeding away from Windsor about the time of Burde’s death. Thus, each item of Habeas Evidence was favorable to Monroe’s defense. B. The second element of a Brady violation requires us to determine whether the prosecution suppressed the Habeas Evidence. As the Supreme Court has pointed out, suppressed evidence is “information which had been known to the prosecution but unknown to the defense.” United States v. Agurs, 427 U.S. 97, 103, 96 S.Ct. 2392, 49 L.Ed.2d 342 (1976). Initially, the Commonwealth insisted that the identity of the Bronco witnesses was disclosed to Monroe’s defense before trial, but it has now dropped this contention, admitting that “[t]he fact of this report was disclosed to the defense in discovery, but the Johnson’s [sic] identity apparently was not.” Appellant’s Br. at 27. In any event, the district court found that the identity of the Bronco witnesses was not disclosed, Habeas Opinion at 49, and its finding on this point is not clearly erroneous. The Commonwealth provides two explanations for its failure to disclose the remaining nine items of Habeas Evidence. First, it contends that the prosecutors did not believe the material had independent exculpatory value. In other words, for most of the Habeas Evidence, the Commonwealth asserts that “the substantive equivalent was put before the jury by the Commonwealth’s witnesses.” Appellant’s Br. at 45; see also id. at 56. However, the disclosure obligation attaches irrespective of the good faith of the prosecutors. Brady, 373 U.S. at 87, 83 S.Ct. 1194. Further, the prosecution has a duty to disclose material even if it may seem redundant. Redundancy may be factored into the materiality analysis, but it does not excuse disclosure obligations. Second, the Commonwealth vigorously contests whether some of the Habeas Evidence existed. In particular, the Commonwealth asserts that it did not agree to help Smith secure a sentence reduction. It also contends that Smith did not have a history of providing information to police prior to testifying against Monroe, and that even if she did, the prosecutors were not aware of this history. Contrary to the Commonwealth’s contentions, the district court found that the prosecutors had agreed to assist Smith obtain a sentence reduction and that they were aware that Smith had provided information in prior investigations. Habeas Opinion at 63. Because these findings are not clearly erroneous, we must adhere to the district court’s decision that the Smith sentence deal and Smith’s informant history were suppressed by the prosecution. C. With the first two requirements of a Brady violation satisfied, we turn to the third—and most difficult—of the Brady elements, that is, whether the suppression of exculpatory evidence was material to Monroe’s first-degree murder conviction. Under Brady, “[t]he touchstone of materiality is a ‘concern that the suppressed evidence might have affected the outcome of the trial.’ ” Spicer v. Roxbury Corr. Inst., 194 F.3d 547, 559 (4th Cir.1999) (quoting Agurs, 427 U.S. at 104, 96 S.Ct. 2392). Put differently, suppressed evidence is material “if there is a reasonable probability that, had the evidence been disclosed to the defense, the result of the proceeding would have been different.” Kyles, 514 U.S. at 433, 115 S.Ct. 1555 (internal quotations omitted). A reasonable probability, in turn, is shown “when the government’s evidentiary suppression undermines confidence in the outcome of the trial.” Id. at 434, 115 S.Ct. 1555 (internal quotations omitted). An important consideration here is that, under Kyles, the question of materiality must be considered “collectively, not item by item.” Id. at 436, 115 S.Ct. 1555. In assessing the issue of materiality, we must evaluate the importance of the Commonwealth’s suppression of the Habeas Evidence. To do so, we first assess the Commonwealth’s evidence that Monroe committed first-degree murder. We then weigh against this evidence the strength of Monroe’s defense. Finally, we consider whether the Habeas Evidence, had it been disclosed and used effectively, is likely to have affected the verdict of first-degree murder. United States v. Bagley, 473 U.S. 667, 676, 105 S.Ct. 3375, 87 L.Ed.2d 481 (1985). In other words, we examine whether the Commonwealth’s suppression of the Habeas Evidence was material to the fairness of Monroe’s trial. 1. It is clear that the Commonwealth’s murder case against Monroe was somewhat thin and entirely circumstantial. Monroe’s admissions during police questioning that she was present when Burde killed himself provided the strongest evidence against her. In addition, the Commonwealth presented evidence that it was unlikely that Burde had committed suicide. Third, the Commonwealth suggested that Monroe was jealous of Krystyna. Fourth, the Commonwealth emphasized that Monroe had a financial interest in Burde’s death. Finally, and importantly, the Commonwealth introduced the testimony of Zelma Smith to support its allegations of premeditation and malice, both of which are essential elements of a first-degree murder prosecution in Virginia. We discuss these aspects of the prosecution’s case in turn. a. First, the prosecution introduced Monroe’s admissions that she had been present when Burde committed suicide. On March 26, 1992, Agent Riley interviewed Monroe two times — first in the morning at Windsor, and again in the afternoon at the Virginia State Police headquarters. During the afternoon interview, Monroe recalled being present when Burde shot himself. At the start of this interview, Riley suggested to Monroe that she had been present when Burde committed suicide and that she must be blocking out that memory. Despite Riley’s repeated and emphatic insistence that she must have been there, Monroe maintained, for about an hour, that she could not remember being present at Windsor when Burde died. It was only after Riley told Monroe that he had witnessed his own father’s suicide that Monroe appeared to recall Burde’s death. Burde’s youngest daughter, Corinna, also testified that Monroe had admitted, over lunch on April 1, 1992, that she (Monroe) had been present at Burde’s suicide. Corinna’s testimony was that Monroe had told her, “I was there when your father committed suicide.” According to Corin-na, she asked Monroe if she could have imagined this, and Monroe responded, “No, I was there.” Monroe allegedly said that she had wanted to tell Corinna at Burde’s funeral, but had not known what to say. Similarly, Monroe signed a statement on June 3, 1992, admitting that she had been present when Burde committed suicide. Riley called Monroe on the morning of June 3, 1992, arranging to meet her at Drewery’s Bluff, a Civil War park in the Richmond area. At this meeting, he presented Monroe with a list of incriminating evidence, and he informed her that the Commonwealth’s Attorney planned to charge her with murder. In response, Monroe steadfastly maintained her innocence and began to backtrack on whether she had been present at Burde’s suicide. She ultimately signed a statement, however, admitting to being present when Burde shot himself. b. Second, the prosecution attempted to show that Burde did not commit suicide. Ann Jones, the Commonwealth’s ballistics expert, testified that she found gunshot residue patterns on Burde’s hands, on the couch on which his body was found, and around the wound itself. According to Jones, these patterns indicated that he had been shot between the third and fourth fingers on his right hand and that the gun had been close to (but not against) his head when it was fired. Further, she suggested that Burde’s right hand had been covering his forehead when the weapon was discharged. Based on this information, Jones concluded that it was unlikely that Burde had killed himself. Dr. Marcella Fierro, the Medical Examiner, also testified for the Commonwealth. According to Dr. Fierro, the type of wound that killed Burde was uncommon in suicide wounds, in that the gun was not directly against his head when it was fired. According to these two witnesses, it was unlikely that Burde had committed suicide, although neither witness could rule out suicide as a possibility. The prosecution also produced evidence that Burde was upbeat and happy prior to his death and that he would not have committed suicide. According to Corinna, she never noticed that her father showed signs of depression. Further, several witnesses testified that Burde had seemed exuberant in the weeks before his death. For example, a real estate broker told the jury that Burde had been ecstatic about the possibility of acquiring a piece of property. Further, the prosecution brought out that Burde had scheduled plans for the days and weeks following his death. For example, the day before he died, he had asked Samuels, his secretary, about purchasing an exercise bike, and on the day of his death, he had made plans to have lunch with his publisher the next afternoon. On the basis of this evidence, the Commonwealth argued that Burde did not commit suicide. c. Third, the prosecution sought to show that Monroe was jealous that Krystyna was replacing her in Burde’s life. Burde’s relationship with Krystyna began in 1989, when Burde and Monroe took a ski trip to Snowshoe Mountain in West Virginia. While waiting for the ski lift, Monroe overheard a couple speaking Polish. Knowing Burde was Polish and would be interested in meeting the couple, Monroe pointed them out. Burde introduced himself to Krystyna and her husband, Wo-jtek Drewnowska, and a friendship quickly developed between the two couples. After a few months, Burde and Krystyna became involved romantically. Monroe apparently knew of this relationship, and for the most part, she accepted it. Krystyna was not Burde’s first fling during his relationship with Monroe, nor was she the only other woman with whom he was involved immediately before his death. As his affair with Krystyna developed, Burde became obsessed with the idea of having another child. He was unhappy with his three children, and he wanted a son to mold in his image. He sought assistance from a number of persons, including several of his girlfriends as well as other acquaintances, about finding a surrogate mother. In order to dissuade Burde from using an anonymous surrogate, one of Monroe’s daughters, Katie, even offered (albeit with reservations) to donate an egg to allow her mother to carry Burde’s baby. Despite these discussions about reproductive options, most of Burde’s friends and family did not, at least initially, take the surrogacy discussions seriously, and they characterized the idea of Burde rearing another child as absurd. Young children irritated him, and he had a poor relationship with his existing children. By 1991, however, it was clear that Burde was serious about having another child. When he could not find an anonymous surrogate, he discussed the idea with Krystyna, and she agreed to carry his baby. In 1990, Wojtek had confronted Krystyna about her affair, and they separated in the spring of that year. Initially, Wojtek and Krystyna merely lived in separate parts of their house, but Krystyna moved out in June of 1991. By February of 1991, Burde and Krystyna were actively trying to conceive a child, but Krystyna was having trouble becoming pregnant. As a result, she and Burde consulted a fertility expert in the Richmond area. This expert, Dr. Edelstein, conducted tests, found nothing physically wrong, and suggested that Burde and Krystyna should try to conceive more frequently. Burde asked Dr. Edelstein about the possibility of sex preselection, but Krystyna rejected the idea as unethical and immoral. In planning for their new baby, Burde and Krystyna prepared several versions of a “baby agreement.” In various drafts of this agreement, Burde agreed to provide support for a child that Krystyna would carry. The drafts also provided that Krystyna and Burde might hold themselves out as a married couple and might agree to live together. In early 1991, Monroe discovered an early draft of the baby agreement, and she testified that she then accepted the fact that Burde was serious about having a child. The baby agreement was never executed, but a later draft provided that Burde could not allow Monroe to accompany him in the presence of the child. Monroe had discovered the later draft three days before Burde died. Through this draft agreement and Krysty-na’s testimony about her relationship with Burde, the Commonwealth contended that Krystyna was replacing Monroe in Burde’s life. d. Fourth, the Commonwealth sought to show that Monroe had a financial interest in Burde’s death. Burde was in the process of drafting a will that, if executed, might have reduced Monroe’s share of his estate to a $20,000 annuity for six years, a Jaguar automobile, and some pieces of artwork from his collection. Under his 1989 will, which was probated, Monroe stood to inherit between $500,000 and $900,000. Monroe was also a joint beneficiary of Burde’s life insurance policy, under which she stood to receive $50,000. The Commonwealth also presented evidence that Burde had given Monroe $155,000 to purchase property on Kanawha Street in Henrico County (the “Kanawha property”). Monroe contributed $40,000 of her own money to purchase the Kana-wha property, and she was the only owner listed on the recorded deed. The real estate lawyer who handled the transaction testified that Burde contacted him in January of 1992, requesting that he “correct” the deed to list Burde as co-owner. Monroe needed to consent for Burde to have an ownership interest in the property, but as of the time of his death, she had not completed the necessary paperwork. The Commonwealth also produced evidence that Burde intended the $155,000 to be a loan and that, in the months before his death, he had wanted to formalize Monroe’s obligation to repay him. While his secretary, Barbara Samuels, had prepared documents to this effect, Monroe never signed them. Through evidence of the draft will, the life insurance policy, the deed correction, and the loan documents, the Commonwealth maintained that Monroe had a financial motive to kill Burde. e. Finally, and importantly, Zelma Smith provided the Commonwealth’s primary evidence of premeditation. Smith, an informant with multiple felony convictions (for larceny, forgery, and check fraud), testified that Monroe had contacted her about a year before Burde’s death in an effort to purchase an untraceable handgun. According to Smith’s testimony, she received a call in the spring of 1991 from someone identifying herself as “Ms. Nelson.” When Smith returned this call, she reached a man who advised her that there was no Ms. Nelson at that number. Smith claimed that she then heard a brief conversation in the background, after which a woman came on the fine. The woman said that she was Ms. Nelson, that it was a bad time to talk, and that she would call Smith back. When Ms. Nelson called back, she asked Smith to meet with her at a Burger King in Richmond. At the Burger King meeting, the woman offered Smith $800 to obtain a small handgun, indicating that she was aware of Smith’s prior criminal history. According to Smith, she received $100 for her expenses. After she obtained a .357 caliber handgun, Smith arranged a follow-up meeting at a local cemetery. At this meeting, however, Ms. Nelson rejected the firearm as too large, although she provided Smith with an additional $480 for her expenses. Smith never heard from Ms. Nelson again. At trial, Smith identified Beverly Monroe as Ms. Nelson. Smith testified that she had read about Monroe’s ease in a news publication, perhaps People magazine, and that she contacted the Commonwealth’s Attorney when she made the connection between Monroe and Ms. Nelson. On the basis of Smith’s testimony, the Commonwealth contended that Monroe had killed Burde with premeditation and malice aforethought, elevating the offense to murder in the first degree. 2. In her defense, Monroe presented two alternate explanations for Burde’s death, both of which supported acquittal. First, she sought to prove that Burde had committed suicide. Second, she suggested that Burde could have been murdered by someone else. In addition to these alternate explanations for Burde’s death, Monroe presented an alibi, showing that she had been at a grocery store miles from Windsor around the time of Burde’s death. Finally, she highlighted the flaws in the police investigation. We briefly review these aspects of her defense. a. First, Monroe presented evidence supporting her contention that Burde had committed suicide. Numerous witnesses testified to Burde’s precarious mental state, portraying him as mentally unstable, overbearing and controlling, cruel and abusive to those around him, and prone to obsessive and paranoid behavior. Monroe also presented evidence indicating that Burde had reason to be suicidal. His desire to produce a male heir was not going as planned; he was strapped for cash; he was concerned about his health; he was preoccupied with death; and he was in danger of being exposed as a fraud. Finally, numerous witnesses, including Commonwealth witnesses, confirmed that Burde was depressed in the weeks and months preceding his death. By all accounts, Burde displayed classic signs of manic depression and narcissism. According to several witnesses, he was constantly embarking on ambitious projects, and he experienced extreme and erratic mood swings, going through periods of elation followed by periods of lethargy and despair. As for the indications of narcissism, numerous witnesses testified that Burde had an inflated sense of self-importance. He was consumed by social status, looking down on others and refusing to associate with those who were not part of the “social elite.” He also had unreasonable expectations that others should conform to his expectations, and he tended to exploit those around him for his own ends. He thought that the women in his life should be treated as his property, and he offered certain of his relatives and friends monetary incentives to adopt the “de la Burde” name. Burde was also portrayed as irritable and overbearing. He was constantly critical of his daughters, calling them insulting names and berating them for the company they kept, the clothes they wore, and the amount of makeup they used. He described them as “losers” and unworthy of the de la Burde name. In a letter to his youngest daughter Corinna, he wrote, “you have carried with you all garbage of low class associations” and “you have to empty your home from the baggage of the past in which you can take neither pride nor happiness.” He warned Corinna that she would “imprison [her] children in the mediocrity for the generations to come” because of her associations with people who were “not from the same class.” In a letter accompanying his 1989 will, he admonished Colette, his oldest daughter, to “[u]se your energy toward higher goals instead of low class pursuits ... [d]ress up, loose [sic] weight, look up and better yourself.” Similarly, in the will itself, he implored Colette to associate “with people of her own upbringing and class.” In order to establish that Burde was the type to contemplate suicide, Monroe introduced evidence that he felt himself to be above common strictures of law and morality. For example, he held unconventional views of personal relationships and sex. He propositioned many of the people who worked for him, men and woman alike. For instance, he made advances toward Charles Moore, a friend who did construction work at Windsor, and he asked Sheldon Goshne — a graduate student who had hved at Windsor while cataloguing Burde’s art collection — -to participate in a menage a trois. His close friends also testified about sex parties hosted by Burde. Burde even sought to persuade Monroe and Frank Vegas, one of Burde’s closest friends, to marry wealthy individuals in order to inherit their money. For example, Vegas testified that Burde introduced him to an older woman and suggested, in apparent sincerity, that Vegas should marry her and then hasten her death by hiding her heart medication. Along similar lines, Burde was involved in unorthodox and illicit business affairs. Most significantly, his prized collection of African sculptures was filled with fakes. Vegas testified that he had sculpted many of the pieces in Burde’s collection and that Burde passed these works off as the works of famous sculptors. At one point, Burde asked Vegas to take up residence in the cottage at Windsor and receive a salary to churn out phony sculptures that could be sold in Europe. Pamela Moore, one of Burde’s ex-girlfriends, testified that she saw Burde “aging” some of his sculptures on his roof so that he could pass them off as older works. Similarly, Charles Moore testified that Burde had him prepare duplicate canvasses of famous paintings. Along these lines, Sig Huber (Burde’s nephew) and Krystyna were caught in New York trying to trade a sculpture under false pretenses. Finally, Monroe presented evidence that Burde’s behavior began to change in January of 1992. For example, he developed a sudden interest in religion, taking up Catholicism in the months before his death (which occurred on Ash Wednesday). He started corresponding with a Polish nun, who chastised him for his sins and admonished him to repent. It came out at trial that Burde was a “follower” of the Nigerian god E’shu, who — legend had it — had committed suicide. Burde had also become concerned about growing older. He talked about death and his fear of dying alone. He was experiencing health problems, including chest pain, prostate problems, blood in his urine, and impotence. He was also worried about gaining weight and losing his hair. He was caught between Krystyna and Monroe, and his dream of a male heir was seemingly never going to materialize. Finally, he was in danger of being exposed as a fraud. In general, several witnesses suggested that Burde had lost his zeal for life. He had spoken of suicide in the past, going so far as to say “I’ll kill myself,” and his mother had attempted to kill herself. On this basis, Monroe argued that Burde had committed suicide. b. As an independent basis for acquittal, Monroe attempted to show that Burde had many enemies, any one of whom could have killed him. In particular, Monroe cast suspicion on Krystyna Drewnowska, characterizing her as a jealous, temperamental mistress. Monroe also suggested that Burde’s family had personal and financial motives to kill him. Corinna, for example, admitted that Burde was a controlling father and that he ridiculed those closest to him. Finally, Monroe identified a litany of other suspects, including Burde’s ex-girlfriends, their husbands, Philip Morris, and those involved in Burde’s illicit business affairs. First, Monroe presented evidence suggesting Krystyna may have murdered Burde. On March 4, 1992, the day Burde died, Krystyna had received a report confirming that her baby was a girl. In the days following Burde’s death, Krystyna cancelled the abortion she had scheduled for March 11, 1992, hired an estate attorney, got a blood sample from Burde to “verify the heirship” of her daughter, gave police a letter that Monroe had written to Burde in 1990, and left the country until Monroe was indicted. Monroe also presented evidence that Krystyna was extremely jealous and that she resented Monroe’s continued presence in Burde’s life. Toward this end, she apparently wanted Burde to agree that Monroe could not accompany him in the presence of their child. Burde’s draft will made no provision for Krystyna or her child, but because of his death, the unborn child stood to inherit under Virginia’s pretermitted child statute. Second, Monroe suggested that Corinna was a logical suspect. Corinna had access to her father’s house; she knew where Burde kept the handgun that killed him; and she smoked the type of cigarettes found in the library near his body. Co-rinna also had a motive to kill her father. She did not get along well with him, describing him as a hard man to please and reportedly fighting with him at family gatherings. According to witnesses, he hated her apartment, her job, her friends, and her appearance, and she resented Burde’s attempts to control her life. Co-rinna knew that her father might disinherit her at any time, and she was unhappy about Krystyna’s pregnancy, knowing that Burde was actively seeking a male heir to replace her as the primary beneficiary of her father’s estate. Finally, Monroe identified a litany of other potential suspects, including: • Wojtek Drewnowska — He was married to Krystyna and jealous of her relationship with Burde. After finding one of Burde’s love letters to Krysty-na, he angrily confronted Burde and told him to stay away from her. He had threatened to expose Burde’s fraudulent art activities. • Pamela Moore — She had an affair with Burde, which had ended badly in 1991 and led to a separation from her husband. She had access to Windsor; she knew where Burde kept his handgun and how to use it; she had a violent temper; and she smoked the brand of cigarettes found at the scene. • Charles Moore — -Pamela’s husband owed Burde money, and Burde had been pressuring him for it in the days before his death. Burde had broken up his marriage and made sexual advances toward Charles himself. Moore had also copied canvasses for the art forgeries, giving him a motive to keep from being implicated in the fraud. • Sheldon Gosline — He might have participated in Burde’s fraudulent art activity. He had helped Burde catalogue the collection, and he admitted that Burde had given false statistics for some of the sculptures. There was an implication that Gosline’s academic reputation might be tarnished by exposure of the fraud, which gave him an incentive to keep the truth from surfacing. • Philip Morris — Burde had stolen sensitive documents from Philip Morris, and he had threatened to expose the company for concealing scientific evidence that smoking was addictive. Burde was fearful that the company would seek to harm him. Monroe’s defense team maintained that, because of these other suspects, the prosecution’s case against her was riddled with reasonable doubt. c. Monroe also produced evidence of an alibi. The Commonwealth’s forensic expert testified that Burde died around 10:30 p.m., on March 4, 1992, a time when Monroe could show that she was miles away from Windsor. Her son, Gavin, testified that she had arrived home at about 10:00 p.m. on the night of Burde’s death. According to Gavin, Monroe asked him if he needed anything from the grocery store. She then departed for the store at about 10:20 p.m., returned home by 10:45 p.m., and remained home for the rest of the evening. Gavin’s testimony was confirmed by a grocery store receipt and a cancelled check, establishing that Monroe was in the Safeway store near her home (about thirteen miles from Windsor) at 10:40 p.m. on March 4, 1992. Further, Monroe produced a neutral witness who testified to having met her in the Safeway store that evening. The witness was sure he recognized Monroe, recalling that he had talked to her about his contracting business and that he had given her his business card. In light of this alibi evidence, it seemed unlikely that Monroe killed Burde. d. Finally, Monroe emphasized the poor investigative work of the police. For example, Deputy Neal failed to secure Windsor as a crime scene on the morning of March 5, 1992. He also failed to follow several standard investigative procedures, including: • collecting the cigarette butts found near Burde’s body or investigating remnants of materials which had recently been burned in the fireplace; • searching for a suicide note or securing other papers in Burde’s office, including legal documents, wills, letters, or notes; • preserving the clothes Burde was wearing or keeping the sofa on which he died; • testing a feather/hair fragment that was resting on Burde’s body when he was found; and • dusting for fingerprints. Even Agent Riley acknowledged that Deputy Neal had conducted a poor investigation, and Monroe suggested that critical forensic evidence — such as hair, fibers, blood, and gunshot residue — had been lost as a result. Monroe also sought to show that Riley had manipulated the investigation of Burde’s death. According to Monroe, Riley had prejudged the investigation, deciding at its outset that she had killed Burde and then setting out with the single goal of proving his theory. In order to provide evidence that the investigation was biased, Monroe showed that Riley pressured Commonwealth experts into accepting his version of Burde’s death. For example, Riley sought to influence the opinions of the Commonwealth’s ballistics and forensic experts. As evidence of this, Monroe brought out that the Medical Examiner’s office delayed issuing a report on Burde’s death and that it altered its initial opinion on the cause of death (ultimately labeling the death a homicide) because of pressure from Riley. In another example of a biased investigation, Monroe sought to establish that Riley ignored many leads, failing to interview suspects such as Krystyna until after Monroe was indicted. 3. The Commonwealth’s first-degree murder case against Monroe can fairly be characterized as tenuous: its evidence was entirely circumstantial, and Monroe presented a strong defense. The Habeas Evidence, had it had been available at Monroe’s trial, would have further undermined an already marginal first-degree murder prosecution. With the trial evidence viewed in this light, we must decide whether, had the Habeas Evidence been properly disclosed, there is a reasonable probability that the verdict of first-degree murder would have been different. The ten items of Habeas Evidence (five of which are impeachment material on Zelma Smith) consisted of the following: (1) the Smith gun deal — the Commonwealth’s promise not to prosecute Zelma Smith, a convicted felon, for her possession of a firearm; (2) the Smith sentence deal — the Commonwealth’s promise to assist Smith in obtaining a sentence reduction on an unrelated charge in Chesterfield County; (3) Smith’s informant history-— Smith’s history of offering information to the authorities before she testified at Monroe’s trial; (4) Smith’s inconsistent statements— Smith’s statements, documented in Riley’s notes, that were inconsistent with Smith’s trial testimony; (5) the Lundy information — Smith’s statement to Riley that Eric Lundy provided her with the firearm she offered to Monroe, an allegation that Lundy denied; (6) Samuels’s personal problems statement — Samuels’s statement to Deputy Neal that Burde had been having personal problems prior to his death; (7) Samuels’s napping habits statement — Samuels’s statement to Deputy Neal that Burde usually napped in a position different from the one in which he was found, that is, on a different couch, on his back, and with his hands behind his head; (8) Corrina’s male heir statement— Corinna’s statement that Krystyna did not want to know the sex of her baby because she knew that Burde did not want a girl; (9) the secretaries’ notes — the notes taken by two secretaries, which corroborate Monroe’s account of a March 26, 1992, interview; and (10) the Bronco witnesses — the identity of two witnesses who told the Powhatan County Sheriffs Office that they saw a vehicle speeding away from Windsor at about the time of Burde’s death. The Commonwealth insists that its suppression of the Habeas Evidence was, in the final analysis, immaterial to Monroe’s conviction, because no single item thereof would have been significant to Monroe’s defense. Contrary to this assertion, we must examine the Habeas Evidence collectively, not item by item. Kyles, 514 U.S. a