Justice Stevens
delivered the opinion of the Court.
In 1982, petitioner was convicted of murder and sentenced to death. The sentence was predicated, in part, on the fact that petitioner had been convicted of a felony in New York in 1963. After the Mississippi Supreme Court affirmed petitioner’s death sentence, the New York Court of Appeals reversed the 1963 conviction. Petitioner thereafter unsuccessfully sought postconviction relief from the Mississippi Supreme Court. The question presented to us is whether the state court was correct in concluding that the reversal of the New York conviction did not affect the validity of a death sentence based on that conviction.
i — (
On December 31, 1981, petitioner and three companions were stopped for speeding by a Mississippi highway patrolman. While the officer was searching the car, petitioner stabbed him and, in the ensuing struggle, one of his companions obtained the officer’s gun and used it to kill him. Petitioner was apprehended, tried and convicted of murder, and sentenced to death. At the conclusion of the sentencing [581]*581hearing, the jury found three aggravating circumstances,1 any one of which, as a matter of Mississippi law, would have been sufficient to support a capital sentence. After weighing mitigating circumstances and aggravating circumstances “one against the other,” the jury found “that the aggravating circumstances do outweigh the mitigating circumstances and that the Defendant should suffer the penalty of death.” 13 Record 2290, 2294; App. 32. The Mississippi Supreme Court affirmed the conviction and sentence, Johnson v. State, 477 So. 2d 196 (1985), and we denied certiorari, 476 U. S. 1109 (1986).
The sole evidence supporting the aggravating circumstance that petitioner had been “previously convicted of a felony involving the use or threat of violence to the person of another” consisted of an authenticated copy of petitioner’s commitment to Elmira Reception Center in 1963 following his conviction in Monroe County, New York, for the crime of second-degree assault with intent to commit first-degree rape. App. 8-9. The prosecutor repeatedly referred to that evidence in the sentencing hearing, stating in so many words: “I say that because of having been convicted of second degree assault with intent to commit first degree rape and capital murder that Samuel Johnson should die.” 13 Record 2276; App. 23.2
[582]*582Prior to the assault trial in New York in 1963, the police obtained an incriminating statement from petitioner. Despite petitioner’s objection that the confession had been coerced, it was admitted into evidence without a prior hearing on the issue of voluntariness. Moreover, after petitioner was convicted, he was never informed of his right to appeal. He made three efforts to do so without the assistance of counsel, each of which was rejected as untimely. After his Mississippi conviction, however, his attorneys successfully prosecuted a postconviction proceeding in New York in which they persuaded the Monroe County Court that petitioner had been unconstitutionally deprived of his right to appeal. The County Court then entered a new sentencing order from which petitioner was able to take a direct appeal. In that proceeding, the New York Court of Appeals reversed his conviction.3 People v. Johnson, 69 N. Y. 2d 339, 506 N. E. 2d 1177 (1987).
[583]*583Petitioner filed a motion in the Mississippi Supreme Court seeking postconviction relief from his death sentence on the ground that the New York conviction was invalid and could not be used as an aggravating circumstance. That motion was filed before the New York proceeding was concluded, but it was supplemented by prompt notification of the favorable action taken by the New York Court of Appeals. Nevertheless, over the dissent of three justices, the Mississippi Supreme Court denied the motion. 511 So. 2d 1333 (1987).
The majority supported its conclusion with four apparently interdependent arguments. First, it stated that petitioner had waived his right to challenge the validity of the New York conviction because he had not raised the point on direct appeal.4 Second, it expressed concern that Mississippi’s capital sentencing procedures would become capricious and standardless if the postsentencing decision of another State could have the effect of invalidating a Mississippi death sentence. Id., at 1338. Third, it questioned whether the New York proceedings were “truly adversarial.” Id., at 1338-1339. Finally, it concluded that the New York conviction provided adequate support for the death penalty even if it was invalid, stating:
“The fact remains that Johnson was convicted in 1963 by a New York court of a serious felony involving violence to a female for which he was imprisoned in that state. No New York court extended Johnson relief from his conviction before Johnson paid his debt to the state. If his crime was serious enough for him to be convicted and [584]*584final enough for him to serve time in a penal institution, it had sufficient finality to be considered as an aggravating circumstance by a jury of this state. No death penalty verdict based upon this conviction need be vitiated by the subsequent relief granted more than twenty years later by the New York Court of Appeals.” Id., at 1339.
In reaching this conclusion, the court expressly disavowed any reliance on the fact that two of the aggravating circumstances found by the jury did not turn on the evidence of petitioner’s prior conviction. Id., at 1338; see, n. 8, infra.5
We granted certiorari to consider whether the Federal Constitution requires a reexamination of petitioner’s death sentence. 484 U. S. 1003 (1988). We conclude that it does.
r-H HH
The fundamental respect for humanity underlying the Eighth Amendment’s prohibition against cruel and unusual punishment gives rise to a special “‘need for reliability in the determination that death is the appropriate punishment’ ” in any capital case. See Gardner v. Florida, 430 U. S. 349, 363-364 (1977) (White, J., concurring in judgment) (quoting Woodson v. North Carolina, 428 U. S. 280, 305 (1976)). Although we have acknowledged that “there can be ‘no per-[585]*585feet procedure for deciding in which cases governmental authority should be used to impose death,’” we have also made it clear that such decisions cannot be predicated on mere “caprice” or on “factors that are constitutionally impermissible or totally irrelevant to the sentencing process.” Zant v. Stephens, 462 U. S. 862, 884-885, 887, n. 24 (1983). The question in this case is whether allowing petitioner’s death sentence to stand although based in part on a reversed conviction violates this principle.6
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Justice Stevens
delivered the opinion of the Court.
In 1982, petitioner was convicted of murder and sentenced to death. The sentence was predicated, in part, on the fact that petitioner had been convicted of a felony in New York in 1963. After the Mississippi Supreme Court affirmed petitioner’s death sentence, the New York Court of Appeals reversed the 1963 conviction. Petitioner thereafter unsuccessfully sought postconviction relief from the Mississippi Supreme Court. The question presented to us is whether the state court was correct in concluding that the reversal of the New York conviction did not affect the validity of a death sentence based on that conviction.
i — (
On December 31, 1981, petitioner and three companions were stopped for speeding by a Mississippi highway patrolman. While the officer was searching the car, petitioner stabbed him and, in the ensuing struggle, one of his companions obtained the officer’s gun and used it to kill him. Petitioner was apprehended, tried and convicted of murder, and sentenced to death. At the conclusion of the sentencing [581]*581hearing, the jury found three aggravating circumstances,1 any one of which, as a matter of Mississippi law, would have been sufficient to support a capital sentence. After weighing mitigating circumstances and aggravating circumstances “one against the other,” the jury found “that the aggravating circumstances do outweigh the mitigating circumstances and that the Defendant should suffer the penalty of death.” 13 Record 2290, 2294; App. 32. The Mississippi Supreme Court affirmed the conviction and sentence, Johnson v. State, 477 So. 2d 196 (1985), and we denied certiorari, 476 U. S. 1109 (1986).
The sole evidence supporting the aggravating circumstance that petitioner had been “previously convicted of a felony involving the use or threat of violence to the person of another” consisted of an authenticated copy of petitioner’s commitment to Elmira Reception Center in 1963 following his conviction in Monroe County, New York, for the crime of second-degree assault with intent to commit first-degree rape. App. 8-9. The prosecutor repeatedly referred to that evidence in the sentencing hearing, stating in so many words: “I say that because of having been convicted of second degree assault with intent to commit first degree rape and capital murder that Samuel Johnson should die.” 13 Record 2276; App. 23.2
[582]*582Prior to the assault trial in New York in 1963, the police obtained an incriminating statement from petitioner. Despite petitioner’s objection that the confession had been coerced, it was admitted into evidence without a prior hearing on the issue of voluntariness. Moreover, after petitioner was convicted, he was never informed of his right to appeal. He made three efforts to do so without the assistance of counsel, each of which was rejected as untimely. After his Mississippi conviction, however, his attorneys successfully prosecuted a postconviction proceeding in New York in which they persuaded the Monroe County Court that petitioner had been unconstitutionally deprived of his right to appeal. The County Court then entered a new sentencing order from which petitioner was able to take a direct appeal. In that proceeding, the New York Court of Appeals reversed his conviction.3 People v. Johnson, 69 N. Y. 2d 339, 506 N. E. 2d 1177 (1987).
[583]*583Petitioner filed a motion in the Mississippi Supreme Court seeking postconviction relief from his death sentence on the ground that the New York conviction was invalid and could not be used as an aggravating circumstance. That motion was filed before the New York proceeding was concluded, but it was supplemented by prompt notification of the favorable action taken by the New York Court of Appeals. Nevertheless, over the dissent of three justices, the Mississippi Supreme Court denied the motion. 511 So. 2d 1333 (1987).
The majority supported its conclusion with four apparently interdependent arguments. First, it stated that petitioner had waived his right to challenge the validity of the New York conviction because he had not raised the point on direct appeal.4 Second, it expressed concern that Mississippi’s capital sentencing procedures would become capricious and standardless if the postsentencing decision of another State could have the effect of invalidating a Mississippi death sentence. Id., at 1338. Third, it questioned whether the New York proceedings were “truly adversarial.” Id., at 1338-1339. Finally, it concluded that the New York conviction provided adequate support for the death penalty even if it was invalid, stating:
“The fact remains that Johnson was convicted in 1963 by a New York court of a serious felony involving violence to a female for which he was imprisoned in that state. No New York court extended Johnson relief from his conviction before Johnson paid his debt to the state. If his crime was serious enough for him to be convicted and [584]*584final enough for him to serve time in a penal institution, it had sufficient finality to be considered as an aggravating circumstance by a jury of this state. No death penalty verdict based upon this conviction need be vitiated by the subsequent relief granted more than twenty years later by the New York Court of Appeals.” Id., at 1339.
In reaching this conclusion, the court expressly disavowed any reliance on the fact that two of the aggravating circumstances found by the jury did not turn on the evidence of petitioner’s prior conviction. Id., at 1338; see, n. 8, infra.5
We granted certiorari to consider whether the Federal Constitution requires a reexamination of petitioner’s death sentence. 484 U. S. 1003 (1988). We conclude that it does.
r-H HH
The fundamental respect for humanity underlying the Eighth Amendment’s prohibition against cruel and unusual punishment gives rise to a special “‘need for reliability in the determination that death is the appropriate punishment’ ” in any capital case. See Gardner v. Florida, 430 U. S. 349, 363-364 (1977) (White, J., concurring in judgment) (quoting Woodson v. North Carolina, 428 U. S. 280, 305 (1976)). Although we have acknowledged that “there can be ‘no per-[585]*585feet procedure for deciding in which cases governmental authority should be used to impose death,’” we have also made it clear that such decisions cannot be predicated on mere “caprice” or on “factors that are constitutionally impermissible or totally irrelevant to the sentencing process.” Zant v. Stephens, 462 U. S. 862, 884-885, 887, n. 24 (1983). The question in this case is whether allowing petitioner’s death sentence to stand although based in part on a reversed conviction violates this principle.6
In its opinion the Mississippi Supreme Court drew no distinction between petitioner’s 1963 conviction for assault and the underlying conduct that gave rise to that conviction. In Mississippi’s sentencing hearing following petitioner’s conviction for murder, however, the prosecutor did not introduce any evidence concerning the alleged assault itself; the only evidence relating to the assault consisted of a document establishing that petitioner had been convicted of that offense in 1963. Since that conviction has been reversed, unless and until petitioner should be retried, he must be presumed innocent of that charge. Indeed, even without such a presumption, the reversal of the conviction deprives the prosecutor’s sole piece of documentary evidence of any relevance to Mississippi’s sentencing decision.
Contrary to the opinion expressed by the Mississippi Supreme Court, the fact that petitioner served time in prison [586]*586pursuant to an invalid conviction does not make the conviction itself relevant to the sentencing decision. The possible relevance of the conduct which gave rise to the assault charge is of no significance here because the jury was not presented with any evidence describing that conduct — the document submitted to the jury proved only the facts of conviction and confinement, nothing more. That petitioner was imprisoned is not proof that he was guilty of the offense; indeed, it would be perverse to treat the imposition of punishment pursuant to an invalid conviction as an aggravating circumstance.
It is apparent that the New York conviction provided no legitimate support for the death sentence imposed on petitioner. It is equally apparent that the use of that conviction in the sentencing hearing was prejudicial. The prosecutor repeatedly urged the jury to give it weight in connection with its assigned task of balancing aggravating and mitigating circumstances “one against the other.” 13 Record 2270; App. 17; see 13 Record 2282-2287; App. 26-30. Even without that express argument, there would be a possibility that the jury’s belief that petitioner had been convicted of a prior felony would be “decisive” in the “choice between a life sentence and a death sentence.” Gardner v. Florida, supra, at 359 (plurality opinion).
We do not share the Mississippi Supreme Court’s concern that its procedures would become capricious if it were to vacate a death sentence predicated on a prior felony conviction when such a conviction is set aside. A similar problem has frequently arisen in Mississippi, as well as in other States, in cases involving sentences imposed on habitual criminals. Thus, in Phillips v. State, 421 So. 2d 476 (Miss. 1982), the court held that the reversal of a Kentucky conviction that had provided the basis for an enhanced sentence pursuant to Mississippi’s habitual criminal statute justified postconviction relief. A rule that regularly gives a defendant the benefit of such postconviction relief is not even arguably arbitrary or capricious. Cf. United States v. Tucker, [587]*587404 U. S. 443 (1972); Townsend v. Burke, 334 U. S. 736 (1948). To the contrary, especially in the context of capital sentencing, it reduces the risk that such a sentence will be imposed arbitrarily.
Finally, we are not persuaded that the state court’s conclusion that under state law petitioner is procedurally barred from raising this claim because he failed to attack the validity of the New York conviction on direct appeal bars our consideration of his claim. In its brief before this Court, the State does not rely on the argument that petitioner’s claim is procedurally barred because he failed to raise it on direct appeal. Because the State Supreme Court asserted this bar as a ground for its decision, however, we consider whether that bar provides an adequate and independent state ground for the refusal to vacate petitioner’s sentence. “[W]e have consistently held that the question of when and how defaults in compliance with state procedural rules can preclude our consideration of a federal question is itself a federal question.” Henry v. Mississippi, 379 U. S. 443, 447 (1965). “[A] state procedural ground is not ‘adequate’ unless the procedural rule is ‘strictly or regularly followed.’ Barr v. City of Columbia, 378 U. S. 146, 149 (1964).” Hathorn v. Lovorn, 457 U. S. 255, 262-263 (1982); see Henry v. Mississippi, 379 U. S., at 447-448. We find no evidence that the procedural bar relied on by the Mississippi Supreme Court here has been consistently or regularly applied. Rather, the weight of Mississippi law is to the contrary. In Phillips v. State, supra, the Mississippi Supreme Court considered whether defendant could properly attack in a sentencing hearing a prior conviction which the State sought to use to enhance his sentence. The court made it clear that the sentencing hearing was not the appropriate forum for such an attack:
“[T]he trial court is not required to go beyond the face of the prior convictions sought to be used in establishing the defendant’s status as an habitual offender. If, on its face, the conviction makes a proper showing that a [588]*588defendant’s prior plea of guilty was both knowing and voluntary, that conviction may be used for the enhancement of the defendant’s punishment under the Mississippi habitual offender act.
“[A]ny such frontal assault upon the constitutionality of a prior conviction should be conducted in the form of an entirely separate procedure solely concerned with attacking that conviction. This role is neither the function nor the duty of the trial judge in a hearing to determine habitual offender status. Likewise, any such proceeding should be brought in the state in which such conviction occurred, pursuant to that state’s established procedures. Should such proceeding in the foreign state succeed in overturning the conviction, then relief should be sought in Mississippi by petition for writ of error coram nobis.” Id., at 481-482.
The reasoning of Phillips suggests that the direct appeal of a subsequent conviction and concomitant enhanced sentence is not the appropriate forum for challenging a prior conviction that on its face appears valid. In directing that evidence of invalidation of such a conviction in another proceeding could be brought to the court’s attention in a collateral attack of the subsequent conviction, the court did not suggest that the failure previously to raise the issue in the inappropriate forum would bar its consideration on collateral attack.
The Mississippi Supreme Court has applied its reasoning in Phillips to facts substantially similar to those presented in this case. In Nixon v. State, 533 So. 2d 1078 (1988), the court held that the reasoning of Phillips applied when a defendant in a capital case sought to attack the validity of a prior conviction introduced to support the finding of an aggravating circumstance at sentencing. In light of the Mississippi Supreme Court’s decisions in Phillips and Nixon, we cannot conclude that the procedural bar relied on by the Mis[589]*589sissippi Supreme Court in this case has been consistently or regularly applied. Consequently, under federal law it is not an adequate and independent state ground for affirming petitioner’s conviction.7
In this Court Mississippi advances an argument for affirmance that was not relied upon by the State Supreme Court. It argues that the decision of the Mississippi Supreme Court should be affirmed because when that court conducted its proportionality review of the death sentence on petitioner’s initial appeal, it did not mention petitioner’s prior conviction in upholding the sentence. Whether it is true, as respondent [590]*590argues, that even absent evidence of petitioner’s prior conviction a death sentence would be consistent with Mississippi’s practice in other cases, however, is not determinative of this case. First, the Mississippi Supreme Court expressly refused to rely on harmless-error analysis in upholding petitioner’s sentence, 511 So. 2d, at 1338; on the facts of this case, that refusal was plainly justified.8 Second, and more importantly, the error here extended beyond the mere invalidation of an aggravating circumstance supported by evidence that was otherwise admissible. Here the jury was allowed to consider evidence that has been revealed to be materially inaccurate.9
Accordingly, the judgment is reversed, and the case is remanded to the Mississippi Supreme Court for further proceedings not inconsistent with this opinion.
It is so ordered.
Justice O’Connor concurs in the judgment.