Opinion by Judge DAVID R. THOMPSON; Partial Concurrence and Partial Dissent by Judge BRUNETTI.

We reconsider this appeal on remand from the Supreme Court, Calderon v. Coleman, 525 U.S. 141 , 119 S.Ct. 500 , — L.Ed.2d - (1998), to determine whether an erroneous jury instruction given by the trial court was harmless. See Brecht v. Abrahamson, 507 U.S. 619, 623 , 113 S.Ct. 1710 , 123 L.Ed.2d 353 (1993). After reconsideration, we conclude, under Brecht , that the instruction had a substantial and injurious effect on the jury’s verdict. Ac *1049 cordingly, we affirm the decision of the district court granting petitioner Russell Coleman’s habeas petition as to his death sentence.

Coleman also asks us to reconsider whether he is entitled to habeas relief from his conviction. He contends that in our prior opinion we mistakenly relied on Gray v. Netherland, 518 U.S. 152 , 116 S.Ct. 2074 , 135 L.Ed.2d 457 (1996), to conclude that the government’s alleged affirmative concealment of inculpatory evidence could not violate due process. Although we agree that we erred by relying on Gray , we affirm the decision of the district court denying relief from the conviction.

FACTS

Because our prior opinion describes the facts of this case in detail, see Coleman v. Calderon, 150 F.3d 1105 (9th Cir.1998), rev’d, Calderon v. Coleman, 525 U.S. 141 , 119 S.Ct. 500 , — L.Ed.2d - (1998), our description here will be brief. Coleman is a California prisoner under sentence of death. In 1981, a jury convicted him of raping and murdering Shirley Hill. The jury also found two special circumstances, which made Coleman eligible for the death penalty under California law. See People v. Coleman, 46 Cal.3d 749, 761 , 251 Cal.Rptr. 83 , 759 P.2d 1260 (1988). Coleman was sentenced to death. His conviction and sentence were upheld by the California Supreme Court.

Coleman then filed a habeas petition in the district court, challenging the constitutionality of his conviction and sentence. The district court denied Coleman relief from his conviction but granted relief from his sentence. The court held that the state trial court erred when, during the penalty phase of Coleman’s trial, the court instructed the jury on the Governor’s power to commute a sentence of life imprisonment without the possibility of parole to a lesser sentence that would include the possibility of parole. The district court also determined that the instructional error was not harmless because, after considering the prosecution’s argument, the aggravating and mitigating evidence and the record as a whole, it was reasonably likely the commutation instruction prevented the jury from giving full effect to Coleman’s mitigation evidence. We affirmed. See Coleman, 150 F.3d at 1105 . Both Coleman and the respondent State of California filed petitions for writs of certiorari. The Supreme Court granted the State’s petition, denied Coleman’s petition, and reversed and remanded the case to this court for reconsideration. See Calderon, 525 U.S. at 147 , 119 S.Ct. 500 .

The Supreme Court determined that even if the state court’s jury instruction was constitutionally deficient, we should have applied a harmless error analysis under Brecht . The Court explained that existing Ninth Circuit authority mistakenly conflated Brecht’s harmless error test with the test for constitutional error set forth in Boyde v. California, 494 U.S. 370, 380 , 110 S.Ct. 1190 , 108 L.Ed.2d 316 (1990). The Court clarified that Boyde merely establishes “the test for determining, in the first instance, whether constitutional error occurred.” Calderon, 525 U.S. at 146 , 119 S.Ct. 500 . If it did, then a reviewing court must go further and determine whether, using a Brecht analysis, the Boyde error had a substantial and injurious effect or influence on the jury’s verdict. Id. at 147, 119 S.Ct. 500 . 1

We begin our analysis by considering whether the state trial court’s jury instruction constituted a Boyde error. To determine whether a Boyde error occurred, we ask “whether there is a reasonable likelihood that the jury has applied the challenged instruction in a way that *1050 prevents the consideration of constitutionally relevant evidence.” Boyde, 494 U.S. at 380 , 110 S.Ct. 1190 .

Because a death sentence is qualitatively different from other forms of punishment, there is a greater need for reliability in determining whether it is appropriate in a particular case. See Fetterly v. Paskett, 997 F.2d 1295, 1300-01 (9th Cir.1993) (quoting Woodson v. North Carolina, 428 U.S. 280, 304-05 , 96 S.Ct. 2978 , 49 L.Ed.2d 944 (1976)). We have therefore held that the Eighth and Fourteenth Amendments require that “the sentencing body’s attention be directed to the specific circumstances of the crime and the characteristics of the defendant.” See Hamilton v. Vasquez, 17 F.3d 1149, 1160 (9th Cir.1994).

Here, the state trial court instructed the jury as follows:

As we have previously explained, this instruction was misleading because it told the jury that the Governor had the power to commute Coleman’s sentence but left out the additional hurdles to be overcome to obtain such a commutation. When a person has two prior felony convictions, as Coleman did, he must apply directly to the Governor to have his sentence commuted. See CaLPenal Code § 4802. The Governor must then confer with the Board of Prison Terms, and may commute the defendant’s sentence only upon the written recommendation of four justices (a majority) of the California Supreme Court. See Cal. Const., Art. 5 § 8; CaLPenal Code §§ 4802, 4813, 4852. The instruction given to Coleman’s jury failed to include this additional information. It was, therefore, misleading. It suggested the Governor could, at his sole discretion, commute a sentence from life imprisonment without the possibility of parole to some lesser sentence that would include the possibility of parole.

Not only was the instruction misleading, it was constitutionally infirm because it discouraged the jury from giving due weight to Coleman’s mitigating evidence. See McLain v. Calderon, 134 F.3d 1383, 1386 (9th Cir.1998); Hamilton, 17 F.3d at 1162-63 ; cf. Boyde, 494 U.S. at 380 , 110 S.Ct. 1190 ; but see People v. Hart, 20 Cal.4th 546, 656 , 85 Cal.Rptr.2d 132 , 976 P.2d 683 (1999) (holding that although a similar instruction was incomplete it was not constitutionally deficient in view of the trial judge’s other comments), cert. denied, — U.S. -, 120 S.Ct. 811 , 145 L.Ed.2d 683 (2000). By explaining that the Governor was entitled to commute the sentence and by directing the jury not to speculate about that fact, the instruction “invited the jury to assume that the question of [Coleman’s] release would automatically come before” the Governor. Hamilton, 17 F.3d at 1161 . We have previously held that this inference is unconstitutional because it invites the jury to speculate that the only way it can avoid a defendant’s release is to sentence him to death. See id. at 1162 ; see also McLain, 134 F.3d at 1386 . In this way, the jury was diverted from its task by having its attention focused on the Governor’s ill-defined commutation power rather than the mitigation *1051 evidence introduced during the penalty phase. See Hamilton, 17 F.3d at 1162-63 .

Having determined that the instruction was constitutionally infirm, we now consider whether the instruction was nonetheless harmless under Brecht . In this part of our analysis, we consider whether the error had a “substantial and injurious effect or influence in determining the jury’s verdict.” Brecht, 507 U.S. at 637 , 113 S.Ct. 1710 (quoting Kotteakos v. United States, 328 U.S. 750, 776 , 66 S.Ct. 1239 , 90 L.Ed. 1557 (1946)). If we are in grave doubt as to whether the error had such an effect, the petitioner is entitled to the writ. See O’Neal v. McAninch, 513 U.S. 432, 436 , 115 S.Ct. 992 , 130 L.Ed.2d 947 (1995).

We conclude the instruction did have a substantial and injurious effect or influence in determining the jury’s verdict. We begin with the instruction itself. The instruction was not only unconstitutionally misleading, it undermined the very core of Coleman’s plea for life. Although an accurate description of sentencing alternatives would have helped the jury focus on its task of evaluating whether the circumstances of this case and the characteristics of this defendant warranted a death sentence, the jury was invited to speculate that the only way it could be assured Coleman would not be released would be to sentence him to death.

The prosecutor’s closing argument exacerbated the impact of the misleading instruction by emphasizing the threat Coleman posed to the general public. Cf. Hamilton, 17 F.3d at 1162 . The prosecutor argued that not only would Coleman pose a continuing threat to prison personnel if he were sentenced to life in prison, he would remain a risk to “all of us” if a death sentence were not imposed. He explained Coleman was unable “to coexist in society as we know it” and implored the jury to impose death, not only to protect prison employees, but “for our benefit as well.” These arguments referring to Coleman’s danger to “all of us” reinforced the instruction’s suggestion that if he were not sentenced to death, he could be paroled into society by the singular whim of a Governor. This focused the jurors’ fear on Coleman’s possible release. See Theodore Eisenberg & Martin T. Wells, Deadly Confusion: Juror Instructions in Capital Cases, 79 Cornell L.Rev. 1, 4 (1993) (“Our data confirm that jurors’ deliberations emphasize dangerousness and that misguided fears of early release generate death sentences.”).

The State argues the prosecutor’s argument did not focus the jurors on the risk of Coleman’s release, nor were the jurors misled by the erroneous instruction. The State contends that Coleman’s mitigation evidence was inconsequential, and the jurors could not have been confused because they returned a verdict of death in less than three hours. We find this argument unpersuasive. The short period of deliberation is more likely explained by the jurors’ focus on the fear Coleman might be paroled if he were not sentenced to death, and their singular attention to that concern to the exclusion of the other factors they were instructed to consider. See Cal.Penal Code § 190.3. At the very least, we “cannot say with fair assurance, after pondering all that happened without stripping the erroneous action from the whole, that the judgment was not substantially swayed by the error.” Kotteakos, 328 U.S. at 765 , 66 S.Ct. 1239 . Accordingly, we affirm the district court’s judgment granting Coleman’s habeas petition as to his sentence of death.

We turn next to Coleman’s contention that although the Supreme Court remanded the case to our court to consider whether the instructional error was harmless, we should take this opportunity to reconsider Coleman’s challenge to his conviction and correct an error in our earlier opinion. Coleman asserts he is entitled to relief from his conviction because the prosecution affirmatively concealed the results of a Hemastix test and bloody print evidence it disclosed. According to Coleman, springing this inculpatory evidence on him *1052 at the time of trial without prior notice violated his Due Process right to a fair trial because it denied him “a reasonable opportunity to know the claims of the opposing party and to meet them.” Morgan v. United States, 304 U.S. 1, 18 , 58 S.Ct. 773 , 82 L.Ed. 1129 (1938); see also Lindsey v. Smith, 820 F.2d 1137, 1151 (11th Cir.1987); United States v. Baum, 482 F.2d 1325, 1331-32 (2d Cir.1973). In our previous opinion, we concluded this argument was foreclosed by Gray v. Netherland, 518 U.S. 152 , 116 S.Ct. 2074 , 135 L.Ed.2d 457 (1996). See Coleman, 150 F.3d at 1112 . We were wrong about that. Coleman now correctly points out that Gray never held that due process is not violated when the government affirmatively conceals inculpatory evidence. The petitioner in Gray raised the issue, but the Supreme Court did not decide it. The Court instead remanded the case to determine whether the argument was procedurally barred. See Gray, 518 U.S. at 170-71 , 116 S.Ct. 2074 .

Although Coleman correctly identifies our error, the State suggests Coleman is barred from raising the issue under the law of the case doctrine. We are inclined to agree. 2 “Law of the case is a jurisprudential doctrine under which an appellate court does not reconsider matters resolved on a prior appeal.” Jeffries v. Wood, 114 F.3d 1484, 1488-89 (9th Cir.1997). This doctrine is founded upon “the sound public policy that litigation must come to an end. An appellate court cannot efficiently perform its duty to provide expeditious justice to all if a question once considered and decided by it were to be litigated anew in the same case upon any and every subsequent appeal.” Kimball v. Callahan, 590 F.2d 768, 771 (9th Cir.1979) (citing White v. Murtha, 377 F.2d 428, 431 (5th Cir.1967)).

Coleman responds our prior opinion never became law of the case because our mandate never issued. See United States v. Simmons, 923 F.2d 934, 956 (2d Cir.1991); cf. United States v. Miller, 822 F.2d 828, 833 (9th Cir.1987). Even if Coleman is correct, however, he is not entitled to relief from his conviction because he cannot show he was prejudiced by the State’s conduct in a way that rendered his trial fundamentally unfair. See Lindsey, 820 F.2d at 1151 (“ ... habeas relief is justified only upon a showing that the impairment to the defense affected the outcome of the trial.”); cf. United States v. Tamura, 694 F.2d 591, 598-600 (9th Cir.1982); United States v. Padrone, 406 F.2d 560, 561 (2d Cir.1969) (concluding noncompliance with an order to furnish a copy of a statement made by the defendant warrants a new trial where there is prejudice).

Coleman has failed to show that he was prejudiced by the State’s concealment of the Hemastix test and the bloody print evidence it disclosed. The presence of a “bloody print” had been noted on a chair back at the crime scene. Coleman’s trial counsel, however, had not examined that chair. The presence of the bloody print was also disclosed in a police report of Coleman’s questioning after his arrest, but Coleman’s trial counsel believed that was simply hyperbole used by the police to try to get Coleman to confess. On the other hand, there was no notation of a bloody print on the police latent print card, and at *1053 the preliminary hearing Inspector Ihle testified there were no bloody prints found at the crime scene.

Coleman’s trial counsel knew, however, that Coleman’s fingerprints had been found in the bungalow where Hill had been murdered, and that his print was on the chair back. What he did not know was that the Hemastix test had been conducted on the material on the chair back and the results of that test showed Coleman’s print was a “bloody print.” It was the results of the Hemastix test that surprised the defense, and the State had violated a discovery order in failing to turn over that evidence. The State does not contest its violation of the discovery order, nor does it contest that Coleman was affirmatively misled.

Notwithstanding these circumstances, however, the defense was able to counter the State’s presentation of the Hemastix test and bloody print evidence. Inspector Ihle admitted that although the Hemastix test showed the presence of blood, it did not indicate whether the blood was human. He also stated he had only used the He-mastix test on a few substances to determine whether it generated false positive results. Finally, he testified he did not even know how the test worked. These points scored by the defense blunted the thrust of the Hemastix test and its results. Indeed, at the evidentiary hearing in the district court, Coleman’s defense counsel testified that he was satisfied by his cross-examination that he had exposed Ihle’s testimony as “absurd.” He did not move for a continuance to combat the evidence further.

Other evidence also placed Coleman at the scene of the murder and pointedi toward his guilt. Fingerprint evidence, bloody or not, demonstrated Coleman had been in the bungalow. The positioning of his prints in relation to Hill’s body and Hill’s own fingerprints also suggested Coleman was the perpetrator of the rape and murder. Serology evidence also placed Coleman at the scene of the crime at the time of the murder. Coleman’s alibi was completely eviscerated. Coleman claimed that he attended class on the day of the murder until 3:30 p.m., left school in the company of a friend, Carlton McAllis-ter, and went home and spent the evening with his family. Class records offered by the prosecution, however, indicated Coleman did not attend class on'that day but was excused. Coleman’s alibi witnesses were also impeached. McAllister admitted that he could have met Coleman on a different day and Coleman’s former wife conceded that she had not told anyone about the alibi earlier, even though it might have absolved Coleman, because she did not think it was “her place to volunteer information.” Finally, Coleman lied about having been in the bungalow where Hill was murdered. Initially he denied ever being in the bungalow, and then when confronted with the fingerprint evidence, he changed his story.

In sum, the evidence of Coleman’s guilt was ample with or without the Hemastix test and bloody print evidence. At trial, the defense effectively blunted the force of that evidence, and the government’s previous concealment of it did not render Coleman’s trial fundamentally unfair.

CONCLUSION

We conclude the district court did not err in granting relief from the sentence. Not only was the erroneous instruction constitutionally infirm, the instruction had a substantial and injurious. effect on the jury’s verdict. We also affirm the district court’s judgment denying Coleman relief from his conviction.

AFFIRMED.

. By clarifying that a Boyde error may be harmless, we note the Supreme Court implicitly overruled McLain v. Calderon, 134 F.3d 1383 (9th Cir.1998); McDowell v. Calderon, 130 F.3d 833 (9th Cir.1997), cert. denied, 523 U.S. 1103 , 118 S.Ct. 1575 , 140 L.Ed.2d 807 (1998); and Hamilton v. Vasquez, 17 F.3d 1149 (9th Cir.1994), to the extent they held that a Boyde error is per se harmful.

. We add Coleman was not without a remedy when we issued our previous opinion. Federal Rule of Appellate Procedure 40(a) establishes the procedure through which a party may move the court to consider "the points of law or fact which in the opinion of the petitioner the court has overlooked or misapprehended.” Coleman never filed a Rule 40(a) motion. Instead, he filed a petition for a writ of certiorari to the Supreme Court, which was denied. Because Coleman failed to either raise the Gray issue in a timely filed Rule 40(a) motion or justify his tardy presentation, he would be foreclosed from seeking relief on this basis now. See Eubank Heights Apartments, Ltd. v. Lebow, 669 F.2d 20, 23 (1st Cir.1982) ("Only upon a showing of injustice of major proportions — not mere arguable error — would we entertain reopening an issued opinion in these circumstances.”); United States v. Gargotto, 510 F.2d 409, 412 (6th Cir.1974); 5 AmJur.2d (Appellate Review) § 879 (1995).