[428] OPINION
MARTHA CRAIG DAUGHTREY, Circuit Judge.
Recent polling results and statistical compilations support many of the economic and penological arguments that have long been raised in opposition to the imposition of the death penalty in the United States.1 Other statistics bolster objections to a form of punishment that, possibly because of its finality, has been shown to have been misdirected. Such polemical discussions, while interesting, are, however, better suited for the deliberations in the chambers of our state and national legislatures. In this appeal, we are not asked to involve ourselves in those debates, or even in a discussion of the constitutionality of the death penalty. Instead, we are required to examine only the constitutional ramifications of court proceedings that are alleged to have infringed John David Stumpfs right to be sentenced in accordance with longstanding principles of due process and fundamental fairness. We conclude that those principles were violated by the state in seeking to execute Stumpf even after it became clear that the basis for the imposition of the death penalty had been seriously compromised in the subsequent prosecution of Stumpfs accomplice, as further explained below. Indeed, the facts of this case exemplify the arbitrariness that prior decisions of the United States Supreme Court and of this court have decried as violative of fundamental constitutional safeguards. As a result, we once again reverse the judgment of the district court and remand this matter for issuance of a writ of habeas corpus, unless the State of Ohio conducts a new sentencing hearing for Stumpf within 90 days of the issuance of this opinion.
I. FACTUAL AND PROCEDURAL BACKGROUND
This habeas case is now before the Sixth Circuit for the second time. Because of the lengthy procedural journey this litigation has taken, numerous state and federal courts have had an opportunity to delve into the facts that led to the conviction and sentencing of petitioner Stumpf. Rather than add yet another gloss to those facts, we reiterate the testimony and initial procedural history that the United States Supreme Court found relevant in its opinion in Bradshaw v. Stumpf, 545 U.S. 175, 125 S.Ct. 2398, 162 L.Ed.2d 143 (2005):
On May 14, 1984, Stumpf and two other men, Clyde Daniel Wesley and Noi’man Leroy Edmonds, were traveling in Edmonds’[s] car along Interstate 70 through Guernsey County, Ohio. Needing money for gas, the men stopped the car along the highway. While Edmonds waited in the car, Stumpf and Wesley walked to the home of Norman and Mary Jane Stout, about 100 yards away. Stumpf and Wesley, each concealing a gun, talked their way into the home by telling the Stouts they needed to use the phone. Their real object, however, was robbery: Once inside, Stumpf held the Stouts at gunpoint, while Wesley ransacked the house. When Mr. Stout moved toward Stumpf, Stumpf shot him twice in the head, causing Mr. Stout to black out. After he regained consciousness, Mr. Stout heard two male voices coming from another room, and then four gunshots — the shots that killed his wife. Edmonds was arrested shortly afterward, and his statements led the police to issue arrest warrants for Stumpf [429] and Wesley. Stumpf, who surrendered to the police, at first denied any knowledge of the crimes. After he was told that Mr. Stout had survived, however, Stumpf admitted to participating in the robbery and to shooting Mr. [Stout]. But he claimed not to have shot Mrs. Stout, and he has maintained that position ever since.
The proceedings against Stumpf occurred while Wesley, who had been arrested in Texas, was still resisting extradition to Ohio. Stumpf was indicted for aggravated murder, attempted aggravated murder, aggravated robbery, and two counts of grand theft. With respect to the aggravated murder charge, the indictment listed four statutory “specifications” — three of them aggravating circumstances making Stumpf eligible for the death penalty. See App. 117-118; Ohio Rev.Code Ann. § 2929.08 (Anderson 1982). The case was assigned to a three-judge panel in the Court of Common Pleas.
Rather than proceed to trial, however, Stumpf and the State worked out a plea agreement: Stumpf would plead guilty to aggravated murder and attempted aggravated murder, and the State would drop most of the other charges; with respect to the aggravated murder charge, Stumpf would plead guilty to one of the three capital specifications, with the State dropping the other two. The plea was accepted after a colloquy with the presiding judge, and after a hearing in which the panel satisfied itself as to the factual basis for the plea. Because the capital specification to which Stumpf pleaded guilty left him eligible for the death penalty, a contested penalty hearing was held before the same three-judge panel. Stumpfs mitigation case was based in part on his difficult childhood, limited education, dependable work history, youth, and lack of prior serious offenses. Stumpfs principal argument, however, was that he had participated in the plot only at the urging and under the influence of Wesley, that it was Wesley who had fired the fatal shots at Mrs. Stout, and that Stumpfs assertedly minor role in the murder counseled against the death sentence. See § 2929.04(B)(6) (directing the sentencer to consider as a potential mitigating circumstance, “[i]f the offender was a participant in the offense but not the principal offender, the degree of the offender’s participation in the offense”). The State, on the other hand, argued that Stumpf had indeed shot Mrs. Stout. Still, while the prosecutor claimed Stumpfs allegedly primary role in the shooting as a special reason to reject Stumpfs mitigation argument, the prosecutor also noted that Ohio law did not restrict the death penalty to those who commit murder by their own hands — an accomplice to murder could also receive the death penalty, so long as he acted with the specific intent to cause death. As a result, the State argued, Stumpf deserved death even if he had not personally shot Mrs. Stout, because the circumstances of the robbery provided a basis from which to infer Stumpfs intent to cause death. The three-judge panel, agreeing with the State’s first contention, specifically found that Stumpf “was the principal offender” in the aggravated murder of Mrs. Stout. App. 196. Determining that the aggravating factors in Stumpfs case outweighed any mitigating factors, the panel sentenced Stumpf to death.
Afterward, Wesley was successfully extradited to Ohio to stand trial. His case was tried to a jury, before the same judge who had presided over the panel overseeing Stumpfs proceedings, and with the same prosecutor. This time, [430] however, the prosecutor had new evidence: James Eastman, Wesley’s cellmate after his extradition, testified that Wesley had admitted to firing the shots that killed Mrs. Stout. The prosecutor introduced Eastman’s testimony in Wesley’s trial, and in his closing argument he argued for Eastman’s credibility and lack of motive to lie. The prosecutor claimed that Eastman’s testimony, combined with certain circumstantial evidence and with the implausibility of Wesley’s own account of events, proved that Wesley was the principal offender in Mrs. Stout’s murder — and that Wesley therefore deserved to be put to death. One way Wesley countered this argument was by noting that the prosecutor had taken a contrary position in Stumpf s trial, and that Stumpf had already been sentenced to death for the crime. Wesley also took the stand in his own defense, and testified that Stumpf had shot Mrs. Stout. In the end, the jury sentenced Wesley to life imprisonment with the possibility of parole after 20 years.
After the Wesley trial, Stumpf, whose direct appeal was still pending in the Ohio Court of Appeals, returned to the Court of Common Pleas with a motion to withdraw his guilty plea or vacate his death sentence. Stumpf argued that Eastman’s testimony, and the prosecution’s endorsement of that testimony in Wesley’s trial, cast doubt upon Stumpf s conviction and sentence. The State (represented again by the same prosecutor who had tried both Wesley’s case and Stumpfs original case) disagreed. According to the prosecutor, the court’s first task was to decide whether the Eastman testimony was sufficient to alter the court’s prior determination that Stumpf had been the shooter. Id. at 210.
Contrary to the argument he had presented in the Wesley trial, however, the prosecutor now noted that Eastman’s testimony was belied by certain other evidence (ballistics evidence[2] and Wes[431] ley’s testimony in his own defense) confirming Stumpf to have been the primary shooter. In the alternative, the State noted as it had before that an aider-and-abettor theory might allow the death sentence to be imposed against Stumpf even if he had not shot Mrs. Stout.
Although one judge speculated during oral argument that the court’s earlier conclusion about Stumpfs principal role in the killing “may very well have had an effect upon” the prior sentencing determination, ibid., the Court of Common Pleas denied Stumpfs motion in a brief summary order without explanation. That order was appealed together with the original judgment in Stumpfs case, and the Ohio Court of Appeals affirmed, as did the Ohio Supreme Court. See State v. Stumpf, 32 Ohio St.3d 95, 512 N.E.2d 598 (1987), cert. denied, 484 U.S. 1079, 108 S.Ct. 1060, 98 L.Ed.2d 1022 (1988).
After a subsequent request for state posteonvietion relief was denied by the state courts, Stumpf filed this federal habeas petition in the United States District Court for the Southern District of Ohio in November 1995. The District Court denied Stumpf relief, but granted permission to appeal on four claims, including the two at issue here. The United States Court of Appeals for the Sixth Circuit reversed, concluding that habeas relief was warranted on “either or both” of “two alternative grounds.” Stumpf v. Mitchell, 367 F.3d 594, 596 (2004). First, the court determined that Stumpfs guilty plea was invalid because it had not been entered knowingly and intelligently. More precisely, the court concluded that Stumpf had pleaded guilty to aggravated murder without understanding that specific intent to cause death was a necessary element of the charge under Ohio law. See Ohio Rev. Code Ann. § 2903.01(B) and (D). Noting that Stumpf had all along denied shooting Mrs. Stout, and considering those denials inconsistent with an informed choice to plead guilty to aggravated murder, the Court of Appeals concluded that Stumpf must have entered his plea out of ignorance. Second, the court concluded that “Stumpfs due process rights were violated by the state’s deliberate action in securing convictions of both Stumpf and Wesley for the same crime, using inconsistent theories.” 367 F.3d, at 596. This violation, the court held, required setting aside “both Stumpfs plea and his sentence.” Id. at 616. One member of the panel dissented.
Bradshaw v. Stumpf, 545 U.S. at 178-82, 125 S.Ct. 2398 (footnote omitted).
After examining the transcript of Stumpfs plea hearing, the Supreme Court disagreed with our analysis regarding the knowing and voluntary nature of the petitioner’s admission of guilt. Thus, finding [432] that we “erred in concluding that Stumpf was uninformed about the nature of the charge he pleaded guilty to, [the Court] reverse[d] that portion of the judgment. ...” Id. at 186, 125 S.Ct. 2398.
The Court determined that we were “also wrong to hold that prosecutorial inconsistencies between the Stumpf and Wesley cases required voiding Stumpfs guilty plea.” Id. at 186-87, 125 S.Ct. 2398. Nevertheless, the majority opinion noted that “[t]he prosecutor’s use of allegedly inconsistent theories may have a more direct effect on Stumpfs sentence, ... for it is at least arguable that the sentencing panel’s conclusion about Stumpfs principal role in the offense was material to its sentencing determination.” Id. at 187, 125 S.Ct. 2398. Because it was not clear to the Court whether we “would have concluded that Stumpf was entitled to re-sentencing had [we] not also considered the conviction invalid,” id., the majority vacated that second portion of our opinion and remanded the matter to us “to consider ... the question of how Eastman’s testimony and the prosecutor’s conduct in the Stumpf and Wesley cases relate to Stumpfs death sentence in particular.” Id. at 187-88, 125 S.Ct. 2398. We now undertake to comply with that directive.
II. DISCUSSION A. Standard of Review
Stumpf filed his original habeas corpus petition in federal district court in November 1995. The provisions of the Antiterrorism and Effective Death Penalty Act of 1996, Pub.L. No. 104-132, 110 Stat. 1214 (1996), effective April 24, 1996, do not, therefore, apply to this case. See Lindh v. Murphy, 521 U.S. 320, 336, 117 S.Ct. 2059, 138 L.Ed.2d 481 (1997). Consequently, we review the district court’s denial of the writ of habeas corpus de novo and its factual findings for clear error. See McQueen v. Scroggy, 99 F.3d 1302, 1310 (6th Cir.1996), overruled on other grounds in In re Abdur’Rahman, 392 F.3d 174 (6th Cir.2004), judgment vacated in Bell v. Abdur’Rahman, 545 U.S. 1151, 125 S.Ct. 2991, 162 L.Ed.2d 909 (2005). We accord some deference to state-court factual findings, which may be rebutted only by “clear and convincing evidence.” Id. Such deference, however, applies only to “basic, primary facts” found by a state court, not to mixed questions of fact and law, which we also review de novo. See id. Because Stumpfs due process claim is just such a mixed question, we subject it to de novo review. See Stumpf v. Mitchell, 367 F.3d at 616 (citing Williams v. Coyle, 260 F.3d 684, 706-07 (6th Cir.2001)).
B. State of Ohio’s Affirmative Defenses
In its brief before this court on remand, the State of Ohio first insists that we may not reach the merits of Stumpfs due process claim that the Supreme Court directed us to address. The state offers three rationales for its position: (1) Stumpf failed to present in the district court a claim that his death sentence was imposed in violation of due process principles; (2) Stumpf also failed to present this claim to the Ohio state courts, thus procedurally defaulting the issue; and (3) the due process claim seeks application of a new rule of constitutional law that is barred by the holding of Teague v. Lane, 489 U.S. 288, 109 S.Ct. 1060, 103 L.Ed.2d 334 (1989). Notably, although this case has already been reviewed by the district court, by this court, and by the Supreme Court, the State of Ohio has not seen fit to raise these procedural arguments before now. See Bradshaw v. Stumpf, 545 U.S. at 190, 125 S.Ct. 2398 (Thomas, J., concurring) (“the State has not argued that Teague v. Lane, 489 U.S. 288, 109 S.Ct. 1060, 103 L.Ed.2d [433]*433334 (1989), forecloses Stumpfs claim that the prosecution’s presentation of inconsistent theories violated his right to due process”); see also id. at 191, 125 S.Ct. 2398 (Thomas, J., concurring) (“[t]he State also has not argued that Stumpf procedurally defaulted his due process claim”).
1. Failure to Present Sentencing Claim
The state’s belated contention that the petitioner did not fully litigate in the district court the due process claim at issue on remand is baseless. In his habeas corpus petition, Stumpf included, under the heading “seventh claim for relief,” the following paragraphs:
76) The trial court’s denial of a motion to vacate a sentence, or to withdraw a plea of guilty which is based upon evidence that did not exist at the time of trial and which the petitioner could not have presented at trial, violated the petitioner’s protections under the Fifth, Eighth and Fourteenth Amendments to the United States Constitution.
77) The trial court would not allow the defense to present a cellmate of the co-defendant to testify that he heard the co-defendant confess to being the principal offender. The confession transpired after the sentencing of the petitioner. The court erroneously ruled that the confession was not newly discovered evidence.
78) The Ohio Fifth District Court of Appeals erroneously held that it was not error even though the state of Ohio tried the co-defendant as the principal in the co-defendant’s trial. The court found the petitioner to be “one of the principal slayers.” Ohio law defines the principal as the actual killer. All evidence points to the co-defendant as the principal.
It is no doubt true, as claimed by the state, that the habeas petition sought redress for the failure of the trial court to allow certain evidence, not for the actions of the prosecution in pursuing conflicting criminal convictions. Nevertheless, the district court invited briefing and argument and actually ruled upon the very issue that the state now argues was not before that court. In fact, in a February 2001 opinion, the district judge specifically addressed Stumpfs argument that “the testimony of Wesley’s cellmate implicating Wesley as the actual shooter, entitled petitioner ... to have a new sentencing hearing.” Three months later, in overruling Stumpfs motion to alter or amend the judgment denying him habeas corpus relief, the district judge again alluded to the fact that he “was ‘troubled’ by the possibility that the state might have secured petitioner’s death sentence by arguing that he was the actual shooter, while later arguing during Wesley’s trial that Wesley was the actual shooter.” It is patently clear to us, therefore, even if not to the state, that Stumpf did not fail to present this issue to the district court. The State of Ohio’s waiver argument is meritless.
2. Procedural Default
We next conclude that the state has waived its claim that Stumpf procedurally defaulted his due process argument by failing to raise it in Ohio state court. Justices Thomas and Scalia, concurring in the judgment in Bradshaw v. Stumpf, conceded that the state did not raise procedural default as a defense in a timely manner. See Bradshaw v. Stumpf, 545 U.S. at 191, 125 S.Ct. 2398. Those two justices continued, however, by noting that “[t]he Court’s opinion does not preclude the State from advancing [such a] procedural defense[ ] on remand.” Id. True, but we also have the authority to decline to exercise our discretion to entertain that argument at this stage of the litigation [434] and, instead, rely upon the Court’s earlier pronouncement in Banks v. Dretke, 540 U.S. 668, 705, 124 S.Ct. 1256, 157 L.Ed.2d 1166 (2004), that “under pre-AEDPA law, exhaustion and procedural default defenses could be waived based on the State’s litigation conduct.” In fact, “[i]f the ... claim was addressed at some stage of federal proceedings, the [State] would have been obligated to raise procedural default as a defense, or lose the right to assert the defense thereafter.” Gray v. Netherlands 518 U.S. 152, 166, 116 S.Ct. 2074, 135 L.Ed.2d 457 (1996) (emphasis added) (citations omitted).
Stumpf has argued throughout his habeas proceedings that his death sentence must be overturned as a result of the state’s duplicitous theories of culpability. Not until the Supreme Court remanded the matter to this court, however, has the State of Ohio deemed it necessary to allege any procedural irregularities in responding to and litigating that claim. Such transparent attempts at gamesmanship at this late date should not be indulged.
3. Teague v. Lane Bar
Nor does the bar fashioned in Teague v. Lane, 489 U.S. 288, 109 S.Ct. 1060, 103 L.Ed.2d 334 (1989), restrict our review of Stumpfs constitutional claim. In Teague, the Supreme Court held that “[u]nless they fall within an exception to the general rule, new constitutional rules of criminal procedure will not be applicable to those cases which have become final before the new rules are announced.” Id. at 310, 109 S.Ct. 1060. In their concurring opinion, Justices Thomas and Scalia correctly quoted Horn v. Banks, 536 U.S. 266, 271, 122 S.Ct. 2147, 153 L.Ed.2d 301 (2002), for the proposition that “if the State does argue that the defendant seeks the benefit of a new rule of constitutional law, the court must apply Teague before considering the merits of the claim.” Bradshaw v. Stumpf, 545 U.S. at 190-91, 125 S.Ct. 2398 (Thomas, J., concurring) (first emphasis added). In this case, however, the State of Ohio “has not argued [until this remanded review] that Stumpfs habeas claims were barred as requiring announcement of a new rule.” Bradshaw v. Stumpf, 545 U.S. at 182, 125 S.Ct. 2398 (emphasis added).
“The Teague bar to the retroactive application of new rules is not ... jurisdictional.” Schiro v. Farley, 510 U.S. 222, 228, 114 S.Ct. 783, 127 L.Ed.2d 47 (1994) (citing Collins v. Youngblood, 497 U.S. 37, 40-41, 110 S.Ct. 2715, 111 L.Ed.2d 30 (1990)). Consequently, “a State can waive the Teague bar by not raising it.” Id. at 229, 114 S.Ct. 783; see also Godinez v. Moran, 509 U.S. 389, 397 n. 8, 113 S.Ct. 2680, 125 L.Ed.2d 321 (1993). Given the State of Ohio’s conscious abandonment of any possible Teague argument here,3 we, [435] like the Supreme Court, “do not apply the rule of Teague v. Lane ... to this case.” Bradshaw v. Stumpf, 545 U.S. at 182, 125 S.Ct. 2398. Instead, according Stumpfs serious allegations of constitutional deprivation the respect they deserve, we choose to address the merits of those charges.4
C. Due Process Claim
The Supreme Court has directed us on remand to clarify whether Stumpf is entitled to re-sentencing even if his convictions are constitutionally valid. See Bradshaw v. Stumpf, 545 U.S. at 187, 125 S.Ct. 2398. In making that determination, we must decide whether the petitioner’s due process rights were abrogated by the prosecution’s insistence on arguing, during Stumpfs sentencing hearing, that Stumpf was the sole gunman who killed Mrs. Stout and, during Wesley’s sentencing hearing, that Wesley was the sole gunman who murdered Mrs. Stout.
The principle is beyond dispute, both legally and logically, that there exists a “heightened ‘need for reliability in the determination that death is the appropriate punishment in a specific case.’ ” Caldwell v. Mississippi, 472 U.S. 320, 323, 105 S.Ct. 2633, 86 L.Ed.2d 231 (1985) (quoting Woodson v. North Carolina, 428 U.S. 280, 305, 96 S.Ct. 2978, 49 L.Ed.2d 944 (1976) (plurality opinion)). See also Oregon v. Guzek, 546 U.S. 517, 525, 126 S.Ct. 1226, 163 L.Ed.2d 1112 (2006) (same); Deck v. Missouri, 544 U.S. 622, 632-33, 125 S.Ct. 2007, 161 L.Ed.2d 953 (2005) (“stress[ing] the ‘acute need’ for reliable decisionmaking when the death penalty is at issue”) (citing Monge v. California, 524 U.S. 721, 732, 118 S.Ct. 2246, 141 L.Ed.2d 615 (1998) (citing Lockett v. Ohio, 438 U.S. 586, 604, 98 S.Ct. 2954, 57 L.Ed.2d 973 (1978))). An erroneously-imposed prison sentence may always be commuted or otherwise shortened to ameliorate sentencing error. A sentence of death, once carried out, may not, of course, be undone. Basic principles of justice and fairness thus mandate that every effort be undertaken to ensure the reliability of the capital-sentencing process. As Justice Brennan noted in his separate opinion in Strickland v. Washington, federal courts “have consistently required that capital proceedings be policed at all stages by an especially.vigilant concern for procedural fairness and for the accuracy of factfinding.” 466 U.S. 668, 704, 104 S.Ct. 2052, 80 L.Ed.2d 674 (1984) (Brennan, J., concurring in part and dissenting in part).
The Due Process Clause of the federal constitution guarantees to every criminal defendant the right to a fair trial. See, e.g., Lassiter v. Dep’t of Soc. Servs., 452 U.S. 18, 25, 101 S.Ct. 2153, 68 L.Ed.2d 640 (1981). Indeed, “[a] fair trial in a fair tribunal is a basic requirement of due process.” Turner v. Louisiana, 379 U.S. 466, 472, 85 S.Ct. 546, 13 L.Ed.2d 424 (1965) (quoting In re Murchison, 349 U.S. 133, 136, 75 S.Ct. 623, 99 L.Ed. 942 (1955)).
[436] In our earlier decision in this matter, we joined with other circuits “in finding that the use of inconsistent, irreconcilable theories to convict two defendants for the same crime is a due process violation.” Stumpf v. Mitchell, 367 F.3d at 611. In doing so, we cited with approval Smith v. Groose, 205 F.3d 1045 (8th Cir.2000), for the proposition that such inconsistencies “render[ ] convictions unreliable, given that ‘[the sjtate’s duty to its citizens does not allow it to pursue as many convictions as possible without regard to fairness and the search for truth.’ ” Stumpf v. Mitchell, 367 F.3d at 612 (quoting Smith, 205 F.3d at 1051). We also quoted the following portion of the Ninth Circuit’s decision in Thompson v. Calderon, 120 F.3d 1045, 1059 (9th Cir.1997) (en banc), vacated on other grounds, 523 U.S. 538, 118 S.Ct. 1489, 140 L.Ed.2d 728 (1998), which in turn quoted from a special concurring opinion by Judge Clark of the Eleventh Circuit in Drake v. Kemp, 762 F.2d 1449, 1479 (11th Cir.1985) (Clark, J., concurring):
[T]he prosecutor’s theories of the same crime in the two different trials negate one another. They are totally inconsistent. This flip[-]flopping of theories of the offense was inherently unfair. Under the peculiar facts of this case the actions by the prosecutor violate the fundamental fairness essential to the very concept of justice.... The state cannot divide and conquer in this manner. Such actions reduce criminal trials to mere gamesmanship and rob them of their supposed search for the truth.
The Supreme Court disagreed with our conclusion that the due process violation undermined Stumpfs conviction because, under Ohio law, “the precise identity of the triggerman was immaterial to Stumpfs conviction for aggravated murder.” Bradshaw v. Stumpf, 545 U.S. at 187, 125 S.Ct. 2398. As a result, the conflicting theories presented to the Stumpf factfinders and to the Wesley factfinders regarding which of the two men shot and killed Mrs. Stout on that fateful May 1984 day in no way affected the reliability of the determination that Stumpf was guilty of aggravated murder in her death.
But, our constitutional duty to ensure the reliability of capital sentencing — to ensure that all individuals are accorded due process before our state and federal judicial institutions — is not relieved by the Supreme Court’s limited ruling in Bradshaw v. Stumpf. Indeed, the Supreme Court itself recognized in its opinion that “[t]he prosecutor’s use of allegedly inconsistent theories may have a more direct effect on Stumpfs sentence ... for it is at least arguable that the sentencing panel’s conclusion about Stumpfs role in the offense was material to its sentencing determination.” Id.
Our examination of the voluminous appellate record leads us to the inescapable conclusion that it is much more than “arguable” that Stumpfs sentencers were swayed by the ultimately-unreliable presentation by the representative of the State of Ohio. In fact, we are convinced that it would amount to nothing short of complete abdication of our sworn responsibilities to ensure the reliability of capital sentencing were we to presume that the state’s later-recanted argument that the petitioner was the triggerman in Mrs. Stout’s murder did not affect the panel’s sentencing decision. Our confidence in our conclusion is buttressed not only by common sense, but also by the words of the various individuals actually involved in the sentencing decision.
For example, during Stumpfs sentencing hearing, the panel of state-court judges found “beyond a reasonable doubt that the defendant was the principal offender in [437] Count One of the Indictment.”5 App. 2182. In fact, when ruling upon Stumpfs petition for a writ of habeas corpus, the district court explained that “the trial court cited its finding that petitioner was the actual shooter as a reason, and a very substantial reason, why the aggravating circumstance outweighed the mitigating factors.” Stumpf v. Anderson, No. C-1-96-668, 2001 WL 242585, at *48 (S.D.Ohio Feb. 7, 2001) (emphasis added). Of course, had the panel also had the opportunity to factor into its decision the certitude with which the State of Ohio argued during Wesley’s trial that Wesley was the principal offender, it would have been hard-pressed to reach such a doubt-free conclusion.
Indeed, during the hearing on Stumpfs motion to withdraw his guilty plea following his conviction and sentencing, one of the three judges who sentenced Stumpf to death noted, “[I]f we had not been satisfied that Stumpf was, in fact, the trigger man, the principal offender, and we were satisfied that he was, in fact, an aider and abettor, that may very well have had an effect upon this Court’s determination of whether the death penalty should follow. I’m not saying it would, but it’s possible.” App. 2600. Unfortunately, that uncertainty can never be dispelled because one of the three judges who served on Stumpfs sentencing panel died prior to that hearing on the motion to withdraw the plea. See App. 2579-80. Because Ohio law requires unanimity when a three-judge panel determines whether aggravating circumstances outweigh mitigating factors beyond a reasonable doubt, see Ohio Rev.Code Ann. § 2929.03(D)(3), if the missing judge in Stumpfs case had shared that view with conviction, based on new information concerning the state’s theory of the case, it is evident that Stumpf would not have been sentenced to death.
We are cognizant of the fact that, at the time of Stumpfs trial, there was no evidence that the prosecutor was aware that Eastman’s testimony would implicate Wesley as the triggerman in Mrs. Stout’s murder. Nevertheless, although the state argued during Wesley’s trial in support of Eastman’s credibility and against the plausibility of Wesley’s account of the murder, during Stumpfs motion to withdraw his guilty plea, the same prosecutor employed a much different tactic. In that later hearing, the state once again argued that Stumpf was the principal offender and this time sought to impugn the very testimony of Eastman on which it had relied during Wesley’s trial.
If we are to take seriously the responsibility of ensuring reliable sentencing determinations in capital cases, we cannot allow the prosecution to play so fast and loose with the facts and with its theories. To allow a prosecutor to advance irreconcilable theories without adequate explanation undermines confidence in the fairness and reliability of the trial and the punishment imposed and thus infringes upon the petitioner’s right to due process.
We are not alone in reaching such conclusions. In In re Sakarias, 35 Cal.4th 140, 25 Cal.Rptr.3d 265, 106 P.3d 931, 944 (2005), for example, the California Supreme Court held that the “use of irreconcilable theories of ... culpability, unjustified by a good faith justification for the inconsistency, is fundamentally unfair, for it necessarily creates the potential for— and, where prejudicial, actually achieves— ... increased punishment on a false factual basis for one of the aecuseds.” Likewise, in Jacobs v. Scott, 513 U.S. 1067, 115 [438] S.Ct. 711, 130 L.Ed.2d 618 (1995), Justice Stevens, dissenting from the denial of stay of execution in a capital case wrote:
[F]or a sovereign State represented by the same lawyer to take flatly inconsistent positions in two different cases— and to insist on the imposition of the death penalty after repudiating the factual basis for that sentence — surely raises a serious question of prosecutorial misconduct. In my opinion, it would be fundamentally unfair to execute a person on the basis of a factual determination that the State has formally disavowed.
Concurring in the Supreme Court’s decision in the present case, Justice Souter also noted that:
[When Stumpf] challenged his death sentence (along with his conviction) on the basis of the prosecution’s position in the Wesley case ... the State did not repudiate the position it had taken in the codefendant’s case, or explain that it had made a mistake there. Instead, it merely dismissed the testimony of the witness it had vouched for at Wesley’s trial ... and maintained that Stumpfs death sentence should stand for some or all of the reasons it originally argued for its imposition. At the end of the day, the State was on record as maintaining that Stumpf and Wesley should both be executed on the ground that' each was the trigger-man, when it was undisputed that only one of them could have been.
Bradshaw v. Stumpf, 545 U.S. at 189, 125 S.Ct. 2398 (Souter, J., concurring) (citation omitted).
As we stated in our prior opinion in this case, “there is more than a reasonable probability that the three-judge panel would not have sentenced Stumpf to death had the prosecution not employed inconsistent and irreconcilable theories.” Stumpf v. Mitchell, 367 F.3d at 617. In fact, even the Ohio Supreme Court has recognized that, under Ohio law, not being the principal offender is normally a “powerful mitigating factor,” and that “[vjery few death sentences have been approved against persons who were not the principal offender.” State v. Green, 90 Ohio St.3d 352, 738 N.E.2d 1208, 1224 (2000) (citation omitted).
The state contends, nevertheless, that both Stumpfs and Wesley’s sentencing proceedings were reliable because Wesley’s jury, in sentencing Wesley to life in prison with the possibility of parole after 20 years, obviously disbelieved Eastman’s testimony regarding Wesley’s role in Mrs. Stout’s murder. According to the state, that jury determination justifies the harsher penalty imposed upon Stumpf. The argument ignores, however, the very real probability that the sentencing decision rendered by Wesley’s jury was influenced in large part by the jury’s knowledge that the prosecutor had already argued that Stumpf was the principal offender and had already convinced a three-judge panel to impose the death penalty upon Stumpf as a result. In short, Wesley’s jury was driven not so much by its disbelief of Eastman as by its unwillingness to imagine that the prosecution would engage in such a flippant, macabre game of chance with people’s lives.
In our system of justice, criminal prosecutors bear special responsibility in ensuring the fairness of all proceedings. As noted 76 years ago by the Supreme Court:
[Because the prosecutor] is in a peculiar and very definite sense the servant of the law, the twofold aim of which is that guilt shall not escape or innocence suffer ..., [i]t is as much his duty to refrain from improper methods calculated to produce a wrongful conviction as it is to use every legitimate method to bring about one.
[439] Berger v. United States, 295 U.S. 78, 88, 55 S.Ct. 629, 79 L.Ed. 1314 (1935). Consequently, “[although the prosecutor must prosecute with earnestness and vigor and ‘may strike hard blows, he is not at liberty to strike foul ones.’ ” Smith, 205 F.3d at 1049 (quoting Berger, 295 U.S. at 88, 55 S.Ct. 629).
Here, the actions of the State of Ohio in the Stumpf and Wesley sentencing proceedings charged at least to the line separating hard blows from foul blows. Whether the prosecutor in the two cases actually crossed that line is not for us to decide in this opinion. Rather, we need only determine whether such double-dealing likely affected the sentencing decision in Stumpfs case. The state argues “that Stumpfs death sentence did not depend on proof that he actually killed Mrs. Stout.” Appellee’s Br. on Remand at 17. We must conclude, however, that it did. Stumpfs sentencers, persuaded by the first of the prosecution’s contradictory arguments, found “beyond a reasonable doubt” that Stumpf was the principal offender and, as such, deserved to be put to death. The fact that the State of Ohio was later able to argue in Wesley’s sentencing hearing that such was not the case after all, yet still object to any effort to reduce Stumpfs punishment, either casts grave doubt on the reliability of Stumpfs sentence or is evidence of an attempt by the prosecution to perpetrate a fraud on the state court. We choose to believe that it is the former and thus hold that the petitioner’s due process rights were violated in this case.
The state insists, however, that even if a constitutional violation occurred in this matter, Stumpf cannot establish that he was prejudiced by it. In reaching that conclusion, the state relies upon the fact that the Supreme Court of Ohio, “[i]n independently determining that Stumpfs death sentence was appropriate, ... specifically considered the testimony of Wesley’s cellmate during Wesley’s trial.” Appellee’s Br. on Remand at 20 (citing State v. Stumpf, 32 Ohio St.3d 95, 512 N.E.2d 598 (1987)). Likewise, the district court, in denying habeas relief to Stumpf, concurred that “the Supreme Court of Ohio cured any potential flaw by independently determining that the aggravating circumstance outweighed the mitigating factors, even in light of the testimony by Wesley’s cellmate.” Stumpf v. Anderson, 2001 WL 242585, at *48. These attempted justifications miss the point, however. The relevant question now before us is not what weight should be given to Eastman’s testimony during Wesley’s sentencing hearing, but rather whether the prosecution’s inconsistent theory and arguments that Stumpf was the principal offender — even though evidence and testimony indicated that he might not be — influenced the decision of Stumpfs sentencers to impose a penalty of death. Again, the record before us requires us to answer with a resounding “yes.”
CONCLUSION
For the reasons set forth above, we conclude that Stumpfs due process rights were violated by the prosecution’s arguments leaving the impression with Stumpfs sentencers that the petitioner was the principal offender in the murder of Mrs. Stout, even though the state had evidence and a belief that co-defendant Wesley was actually the triggerman in Mrs. Stout’s murder. Because all indications are that the three-judge panel that sentenced Stumpf to death would not have done so had the state not persisted in its efforts at duplicity, we also hold that the petitioner was prejudiced by that constitutional violation. We thus once again REVERSE the judgment of the district court and REMAND this matter for issuance of [440] a conditional writ of habeas corpus unless the State of Ohio elects to accord Stumpf a new sentencing hearing within 90 days of the issuance of this opinion.