UNITED STATES COURT OF APPEALS FOR THE NINTH CIRCUIT
September 1, 2011; withdrawn September 27, 2011
LEVI JAIMES JACKSON,
CHARLES RYAN, RESPONDENT-APPELLEE.
Appeal from the United States District Court for the District of Arizona Raner C. Collins, District Judge, Presiding D.C. No. CV-01-00545- TUC-RCC
The opinion of the court was delivered by: Gertner, District Judge:
Argued and Submitted May 10, 2011-San Francisco, California
Before: Betty B. Fletcher and Sidney R. Thomas, Circuit Judges, and Nancy Gertner, District Judge.*fn1
Opinion by Judge Gertner
In 1993, a jury in an Arizona state court convicted Petitioner-Appellant Levi Jackson ("Jackson") of first degree murder. The evidence presented at trial suggested that the victim was carjacked by then sixteen-year-old Jackson and two older men, driven to the desert, and shot. The trial court instructed the jury that it could convict Jackson of first degree murder on a theory of either premeditated murder or felony murder. The trial court further instructed that, to find felony murder, "[i]t is enough if the felony and the killing were part of the same series of events."
After the Arizona Supreme Court affirmed his conviction, Jackson petitioned for post-conviction relief ("PCR"), claiming that his trial and appellate counsel had rendered ineffective assistance of counsel ("IAC") by failing to argue either at trial or on appeal that the "same series of events" felony murder instruction unconstitutionally relieved the State of its burden to prove all the elements of felony murder. The state superior court denied Jackson's petition, finding that he did "not establish a colorable claim of ineffective assistance of [trial or] appellate counsel." The Arizona Supreme Court summarily affirmed.
Jackson petitioned for federal habeas relief pursuant to 28 U.S.C. § 2254, raising, inter alia, the same ineffective assistance of counsel claims that he had brought in state court. See Strickland v. Washington, 466 U.S. 668 (1984). The district court found that the felony murder instruction was not erroneous; that it did not deprive Jackson of due process; and that, therefore, counsel was not ineffective in failing to object to it. Jackson v. Ryan, No. CV-01-545-TUC-RCC, 2009 WL 4042910, at *7-11 (D. Ariz. Nov. 18, 2009).
Arizona law required that to convict Jackson of first degree murder under a theory of felony murder, the State had to prove that Jackson caused the death of the victim "in the course of and in furtherance of" the predicate felony. Ariz. Rev. Stat. § 13-1105(A)(2) (1978). The Arizona Supreme Court has construed the "in furtherance of" element to mean that a defendant must have killed the victim "to facilitate the accomplishment of" the felony. State v. Miles, 186 Ariz. 10, 15 (1996); State v. Arias, 131 Ariz. 441, 443 (1982). But while the trial court initially recited the statutory "in furtherance" language of Arizona's felony murder statute, it went further. It added a different and contradictory admonition- that "[i]t is enough if the felony and the killing were part of the same series of events." Under the circumstances, there is a reasonable likelihood that Jackson's jury would not have understood the need to find the "in furtherance" link between the killing and the underlying felony, thereby relieving the State of its obligation to prove every element of felony murder beyond a reasonable doubt in violation of Jackson's right to due process of law. See Boyde v. California, 494 U.S. 370, 380 (1990); see also Estelle v. McGuire, 502 U.S. 62, 72-73 (1991); Francis v. Franklin, 471 U.S. 307 (1985); Sandstrom v. Montana, 442 U.S. 510 (1979); In re Winship, 397 U.S. 358, 363-64 (1970).
 That finding, however, does not resolve Jackson's habeas petition. The Antiterrorism and Effective Death Penalty Act of 1996 ("AEDPA"), 28 U.S.C. § 2254, as recently elaborated by the Supreme Court in Harrington v. Richter, 131 S. Ct. 770 (2011), requires several more steps. Richter mandates deference even to a state court's summary denial of a habeas petition. Id. at 783-85. Deference means that we are to hypothesize the arguments that "could have supported[ ] the state court's decision," and then determine if "fairminded jurists could disagree" that these arguments were unreasonable under federal law. Id. at 786. In addition, Richter suggests that where the right at issue is ineffective assistance of counsel, habeas review is doubly deferential. Id. at 785.
Specifically, Jackson must show: 1) that trial and/or appellate counsel's failure to object to the instruction fell below the professional norms existing at the time of Jackson's trial, see Strickland, 466 U.S. at 687-91 (the performance prong); 2) that the state court's conclusion that counsel's performance was adequate in the face of that failure represented an unreasonable application of Strickland, see Richter, 131 S. Ct. at 785; 3) that "there is a reasonable probability that, but for counsel's unprofessional errors, the result of the proceeding would have been different," Strickland, 466 U.S. at 694 (the prejudice prong);*fn2 and 4) that the state court's conclusion to the contrary on the prejudice prong was an unreasonable application of clearly established federal law, see Richter, 131 S. Ct. at 785.
Since the district court rejected Jackson's claim that the trial court's felony murder instruction was erroneous, it never reached these questions. See Jackson, 2009 WL 4042910, at *10. Furthermore, since Jackson framed the issue in his certificate of appealability as an instruction issue, not an ineffective assistance of counsel claim more broadly, neither party address these issues. Accordingly, we remand for the district court to consider the questions outlined above.
I. Robbery and Trial*fn3
On December 7, 1992, Kevin Miles ("Miles"), Ray Hernandez ("Hernandez"), and Jackson approached Patricia Baeuerlen ("Baeuerlen") as she stopped her car at an intersection in Tucson, Arizona.*fn4 One of the men pointed a gun at her and ordered her to move over. Jackson, Miles, and Hernandez then got into the vehicle and drove to a desert area on the southeast side of Tucson. Baeuerlen was ordered out of the car, and several minutes later she was fatally injured by a single gunshot wound to the heart. Her body was found about seven hours later.
The next day, Miles left for Phoenix, driving Baeuerlen's car. The police apprehended him early on December 9, 1992, after a high-speed chase. In addition to Baeuerlen's car, they also found her ATM card, credit card, and personal effects in Miles' possession. Jackson's thumb print was found on the car's rearview mirror, on a cassette tape in the car, and on a plastic bag in the trunk. Hernandez's mother found a gun hidden in a hole in the wall of his bedroom closet and turned it over to police. No useable fingerprints were recovered from it. Jackson was arrested December 10, 1992.
On February 26, 1993, Jackson was indicted on one count of first degree murder, one count of kidnapping, and one count of armed robbery. Although Miles and Hernandez were similarly charged, the State tried Jackson separately.*fn5 Two days before the start of Jackson's trial, Hernandez entered into a plea agreement and agreed to testify against him. Hernandez did not do so, however, until the sentencing phase.
At trial, the State pursued theories of both premeditated murder and felony murder. A state witness claimed to have seen Hernandez and Miles entering a house from which the gun used to kill Baeuerlen was stolen. Evidence of Jackson's fingerprints in Baeuerlen's car and his gang affiliation, along with photographs from a bank ATM camera showing Jackson using Baeuerlen's ATM card to withdraw money, were introduced. The jury heard that no useable prints were recovered from the gun hidden in Hernandez's closet. They also learned that, after the murder, Miles kept the car and proceeds, while Hernandez hid the gun in his room.
Since neither Miles nor Hernandez testified, the State's account of what happened during the carjacking and murder largely depended on the conflicting accounts Jackson had given to various acquaintances before and after his arrest. In some versions, Jackson said that he had shot Baeuerlen; in others, he reported that either Miles or Hernandez was the gunman.
Jackson did not testify. Based on the various statements Jackson had made and the evidence, Jackson's counsel argued to the jury that Miles and Hernandez stole the gun before Miles carjacked and murdered Baeuerlen and that Jackson was not present during the carjacking or subsequent murder.*fn6
Jackson further claimed that he was picked up by Miles in Baeuerlen's car after Miles had killed Baeuerlen and that his confessions were false and should be attributed to a troubled teenager "bragging" and "acting tough."
II. Jury Instructions and Deliberations
The trial court instructed the jury that it could find Jackson guilty of first degree murder if the State proved either theory -premeditated murder or felony murder-beyond a reasonable doubt. See Ariz. Rev. Stat. § 13-1105 (1978). The court further instructed the jury that they did not have to unanimously agree to a single theory of liability, so long as all of them agreed that either theory applied. With respect to felony murder, the court instructed the jury as follows:
A person commits first degree murder if such person, acting alone or with one or other persons, commits or attempts to commit robbery or kidnapping, and in the course of and in the furtherance of such offense, or the immediate flight from such offense, such person or another person causes the death of any person. This type of first degree murder requires no specific mental state other than that which is required for the commission of the offense of robbery or kidnapping.
"In the course of committing" includes any of the defendant's acts, beginning with the initiation and extending through the flight from a robbery or kidnapping.
With respect to the felony murder rule, insofar as it provides the basis for a charge of first degree murder, it is not necessary that the State prove that the defendant intended to kill.
With respect to the felony murder rule, insofar as it provides the basis for a charge of first degree murder, it is the law that there is no requirement that the killing occur while committing or engaged in the felony or that the killing be part of the felony. The homicide [need not] have been committed to perpetrate the felony. It is enough if the felony and the killing were part of the same series of events.
After about seven hours of deliberations, the jury announced that it had found Jackson guilty of first degree murder, kidnapping, and armed robbery.*fn7 A few days later, the jury foreperson sent the trial judge a "confidential" letter, State v. Jackson, 186 Ariz. 20, 28-29 (1996), which suggested that they had had problems with the felony murder instruction.*fn8
After a mitigation/aggravation hearing, the trial court sentenced Jackson to death.
III. Direct Appeal and Petition for Post-Conviction Relief
Appeal to the Arizona Supreme Court was automatic because of the death penalty. Although Jackson raised numerous claims of trial and sentencing errors, he did not argue that the felony murder instruction unconstitutionally relieved the State of its obligation to prove every element of the offense or that his trial attorney provided ineffective assistance of counsel by failing to challenge the instruction. Jackson, 186 Ariz. at 23. The court affirmed Jackson's convictions and death sentence. Id. at 32.
Jackson filed for post-conviction relief under Ariz. R. Crim. P. 32, now raising several ineffective assistance of counsel claims, including, inter alia, that counsel was ineffective for failing to object to a felony murder instruction that unconstitutionally relieved the State of its burden of proving each element of the offense.*fn9
The Arizona Superior Court dismissed Jackson's PCR petition. The court rejected the multiple claims alleging ineffective assistance of trial counsel, including counsel's failure to object to the felony murder instruction, "because they could have been raised on direct appeal and do not state a colorable basis for post-conviction relief." The court also rejected Jack-son's multiple claims of ineffective assistance of appellate counsel, including appellate counsel's failure to challenge the felony murder instruction on direct appeal, because counsel's performance did not fall below professional norms and Jackson failed to demonstrate that, but for counsel's allegedly ineffective representation, the Arizona Supreme Court would have decided the appeal differently.
Jackson sought review by the Arizona Supreme Court, renewing, inter alia, his Strickland claims based upon the defective felony murder instruction. The court denied review without comment in October 2001.
IV. Federal Petition for Habeas Corpus
Later that month, Jackson filed a petition for a writ of habeas corpus in the District Court for the District of Arizona. His petition included the claim at issue here. Since Jackson was 16 years old at the time of his offense, the district court stayed the proceedings while he sought state post-conviction relief under the Supreme Court's decision in Roper v. Simmons, 543 U.S. 551, 568-75 (2005), which held that the Eighth Amendment prohibits the execution of an individual who was under the age of 18 at the time of his capital crime. The state court subsequently vacated Jackson's death sentence and re-sentenced him to life imprisonment with the possibility of release after twenty-five years.
Jackson continued to pursue his federal habeas petition.*fn10
The district court reviewed Jackson's Strickland claim based on the felony murder instruction de novo,*fn11 but denied relief on that claim. Jackson, 2009 WL 4042910, at *7-10, *21.*fn12
The court based its conclusion on the Arizona Supreme Court's decision upholding the conviction of Jackson's co-defendant Miles. Id. at *8-10 (citing Miles, 186 Ariz. at 15). Miles challenged the same felony murder instruction as Jack- son, except his counsel raised the claim at trial and on direct appeal. See Miles, 186 Ariz. at 15. As the district court noted, the Arizona Supreme Court concluded in Miles that, notwithstanding the "it is enough" sentence, the instruction as a whole did not mislead the jury because the court also recited the statutory language-"in the course of and in the furtherance of." Jackson, 2009 WL 4042910, at *8 (quoting Miles, 186 Ariz. at 15).
Recognizing that "it is not the province of a federal habeas court to question a state court's construction of state law," id. at *9 (citing Estelle, 502 U.S. at 72), and finding no reason to question the state court's resolution of the comparable issue in Miles, the district court rejected Jackson's challenge, id. at *9-10.*fn13
Jackson moved for a certificate of appealability on three issues, one of which was whether his constitutional right to due process was violated by the trial court's felony murder instruction. While he did not move for a certificate on the broader question of ineffective assistance of counsel, the respondent does not argue that the claim was waived.
I. Standard of Review
This Court reviews de novo the district court's decision to deny a petition for habeas corpus. Leavitt v. Arave, 383 F.3d 809, 815 (9th Cir. 2004). Under AEDPA, a federal court cannot grant a state prisoner's habeas petition with respect to any claim that was adjudicated on the merits in State court proceedings unless the adjudi- cation of the claim-(1) resulted in a decision that was contrary to, or involved an unreasonable application of, clearly established Federal law, as determined by the Supreme Court of the United States; or (2) resulted in a decision that was based on an unreasonable determination of the facts in light of the evidence presented in the State court proceeding.
28 U.S.C. § 2254(d); see also Barker v. Fleming, 423 F.3d 1085, 1091 (2005).
Although the State's initial brief did not suggest that the district court erred by reviewing Jackson's habeas petition de novo, we asked the parties to submit supplemental briefs in light of Richter. We now conclude that Richter requires defer-ential review. See 131 S. Ct. at 784-85.
Under Richter, when a federal claim has been presented to a state court and the state court has denied relief, it should be "presumed that the state court adjudicated the claim on the merits in the absence of any indication or state-law procedural principles to the contrary." 131 S. Ct. at 784-85 (citation omitted). In this case, when Jackson submitted his post-conviction petition for review to the Arizona Supreme Court, he articulated his felony murder instruction claim as a component of his ineffectiveness claims. The Arizona Supreme Court then summarily denied review. Jackson has provided no persuasive reason to overcome the Richter presumption that this denial was a decision on the merits, especially given the court's previous decision in Miles.
Moreover, although the Arizona Supreme Court did not explain its decision to deny review of the Arizona Superior Court's denial of Jackson's PCR petition, the lower court did explain its decision. The Superior Court found that Jackson's claim of ineffective assistance of trial counsel based on the failure to object to the instruction was insufficient to warrant post-conviction relief both because of Jackson's failure to raise the claim on direct appeal and because the claim did not "state a colorable basis for post-conviction relief." The Arizona Superior Court similarly found Jackson's claim of ineffective assistance of appellate counsel based on the failure to challenge the felony murder instruction on direct appeal not colorable because of Jackson's inability to show that appellate counsel's performance fell below professional norms and that better representation would have affected the outcome of the appeal.
Under 28 U.S.C. § 2254(d)(1), we must deny Jackson's petition unless the state's adjudication of his Strickland claim "resulted in a decision that was contrary to, or involved an unreasonable application of, clearly established Federal law, as determined by the Supreme Court of the United States." A state court's decision is "contrary to" this body of law if it "applies a rule that contradicts the governing law" articulated by the Supreme Court or arrives at a result different than that reached by the Supreme Court in a case with "materially indistinguishable" facts. Williams v. Taylor, 529 U.S. 362, 405-06 (2000). A decision involves an "unreasonable application" of clearly established federal law if it "identifies the correct governing legal principle . . . but unreasonably applies that principle to the facts of the prisoner's case." Id. at 413.
As the Court noted in Richter, even when the state court renders a summary denial, under § 2254(d), a habeas court "must determine what arguments or theories supported or, as here, could have supported, the state court's decision; and then it must ask whether it is possible fairminded jurists could disagree that those arguments or theories are inconsistent with the holding in a prior decision of this Court." 131 S. Ct. at 786.*fn14
II. Felony Murder Instruction
We begin by considering the challenged felony murder instruction on which Jackson's Strickland claim is based. If this instruction is not unconstitutional, then counsel's failure to object was not deficient performance.
 Due process "protects the accused against conviction except upon proof beyond a reasonable doubt of every fact necessary to constitute the crime with which he is charged." In re Winship, 397 U.S. at 364. The Due Process Clause of the Fourteenth Amendment thus prohibits the State from using jury instructions that have the effect of relieving the State of that burden. Francis, 471 U.S. at 326; see Patterson v. Gomez, 223 F.3d 959, 962 (9th Cir. 2000) ("A jury instruction cannot relieve the state of the burden of proving beyond a reasonable doubt a crucial element of the criminal offense.").
According to Jackson, the felony murder instruction was contradictory-initially accurate, telling the jury that the murder must be "in furtherance of" the felony, but later inaccurate, telling the jury that "[i]t is enough if the felony and the killing were part of the same series of events." In considering the challenged instruction, we must determine " 'whether there is a reasonable likelihood that the jury has applied the challenged instruction in a way' that violates the Constitution.' " Estelle, 502 U.S. at 72 (quoting Boyde, 494 U.S. at 380). "A 'reasonable likelihood' is lower than the 'more likely than not' standard but higher than a mere 'possibility.' " Polk v. Sandoval, 503 F.3d 903, 910 (9th Cir. 2007) (citing Boyde, 494 U.S. at 380).
A. Due Process
 The felony murder statute in effect at the time of Jack-son's 1992 offense provides that a person commits first degree murder if (1) that person intentionally and with premeditation causes another's death; or (2):
Acting either alone or with one or more other persons the person commits or attempts to commit [certain enumerated felonies including kidnapping and robbery] and, in the course of and in furtherance of the offense or immediate flight from the offense, the person or another person causes the death of any person.
Ariz. Rev. Stat. § 13-1105(A)(1)-(2) (1978) (emphasis added).*fn15
 The meaning of Arizona's felony murder statute, including the meaning of the "in furtherance of" element, is a question of state law. See Francis, 471 U.S. at 315-16; Sandstrom, 442 U.S. at 516-17. In Arias, the Arizona Supreme Court held:
[T]he application of the ["in furtherance of" language in the] felony-murder rule found in § 13-1105(A)(2) hinges upon the resolution of the following question: did the death result from an action taken to facilitate the accomplishment of one or more of the felonies enumerated in § 13-1105(A)(2)? If the answer to this question is in the affirmative, then the felon may be found guilty of first-degree murder.
131 Ariz. at 443.*fn16 The court reaffirmed this holding in Miles, stating: "A death is 'in furtherance' of the underlying felony if the death resulted from an action taken to facilitate the accomplishment of one or more of the predicate felonies." 186 Ariz. at 15 (citing Arias, 131 Ariz. at 443). As commonly defined, "to facilitate" means "to make easier" or to "help bring about." Merriam-Webster's Collegiate Dictionary 509 (11th ed. 2003).
Reciting the language of Arizona's felony murder statute, the trial court stated that:
[A] person commits first degree murder if such person, acting alone or with one or other persons, commits or attempts to commit robbery or kidnapping, and in the course of and in the furtherance of such offense, or the immediate flight from such offense, such person or another person causes the death of any person.
However, the court went on to say that the "homicide [need not] have been committed to perpetrate the felony." And, it ended by declaring: "It is enough if the felony and the killing were part of the same series of events." The question is whether, on balance, the introductory sentence reciting the statutory language was sufficient to cure the court's final and incorrect assertion that felony murder had no facilitation requirement. We find that it was not.
 In assessing how a reasonable juror would have understood the charge, we must pay "careful attention to the words actually spoken to the jury." Sandstrom, 442 U.S. at 514 (citing Ulster Cnty. Court v. Allen, 442 U.S. 140, 157-59 n.16 (1979)). Two things are clear: A reasonable juror would have understood the court's opening sentence to mean that there is an "in furtherance of" or facilitation element in felony murder; at the same time, a reasonable juror would have understood the court's final "same series of events" sentence as meaning the opposite-that there must be only a temporal link between the underlying felony and the homicide. In addition, in considering how these contradictory directives would have been reconciled by a reasonable juror, we must look to " 'the context of the overall charge.' " Pulido v. Chrones, 629 F.3d 1007, 1012 (9th Cir. 2010) (quoting Cupp v. Naughten, 414 U.S. 141, 146-47 (1973)). We find three features illustrative: the fact that the "same series" sentence was the court's final word on the elements of felony murder,*fn17 the use of the phrase "[i]t is enough,"*fn18 and the lack of any other clarifying instruction. Taking these factors together, we find that a reasonable juror would have resolved the court's contradictory explanations of felony murder by finding that the "same series of events" instruction negated its "in furtherance of" instruction. We hold that in this case, " 'there is a reasonable likelihood that the jury has applied the challenged instruction in a way' that violates the Constitution." Estelle, 502 U.S. at 72 (quoting Boyde, 494 U.S. at 380).
 In Miles, the Arizona Supreme Court considered the same felony murder instruction in the case of Jackson's co-defendant and found that, because "the court gave the 'in the course of and in the furtherance of' language of the statute," the "instruction taken as a whole [did] not mislead the jury." 186 Ariz. at 15 (citation omitted). While the Arizona Supreme Court did not cite to its previous decision in Miles when denying Jackson's post-conviction petition, Richter counsels that we hypothesize what arguments could have supported the state court's decision and then ask whether fairminded jurists could disagree with those arguments. See 131 S. Ct. at 786. We presume that the Arizona Supreme Court was relying upon Miles when dismissing Jackson's petition, but we conclude, however, that it was unreasonable for it to do so.
 The State incorrectly claims that "Jackson presents a quintessential state-law claim that is non-cognizable on federal review and thus does not state a proper ground for federal habeas relief." It has been clear since the Supreme Court's decision in Sandstrom-where the Court held that a jury instruction that a person is presumed to intend the ordinary consequences of his voluntary actions "reliev[ed] the State of the burden of proof enunciated in Winship on the critical question of petitioner's state of mind," 442 U.S. at 521-that a state supreme court "is, of course, the final authority" on the meaning of a statutory phrase under state law. Id. at 517. Thus, in this case, the Arizona Supreme Court is the final authority on the meaning of the phrase "in furtherance of" under Arizona law. However, "it is not the final authority on the interpretation which a jury could have given the [felony murder] instruction." Id. at 517. " '[W]hether there is a reasonable likelihood that the jury has applied the challenged instruction in a way' that violates the Constitution," Estelle, 502 U.S. at 72 (quoting Boyde, 494 U.S. at 380), is a "federal constitutional question," Francis, 471 U.S. at 316. In this case, Jackson is not challenging the state court's construction of its own statute. He is accepting as the premise of his challenge to the jury instruction the repeated statements of the Arizona Supreme Court, first in Arias, and later in Miles, that "[a] death is 'in furtherance' of the underlying felony if the death resulted from an action taken to facilitate the accomplishment of one or more of the predicate felonies." Miles, 186 Ariz. at 15 (citing Arias, 131 Ariz. at 443). Significantly, the State's brief nowhere suggests that these statements are not holdings on the meaning of the "in furtherance of" element. They plainly are, and they are binding on a federal habeas review court.
 The Miles court failed to analyze the words of the instruction as required by federal law. See Estelle, 502 U.S. at 72-73; Boyde, 494 U.S. at 378-86; Francis, 471 U.S. at 313-27; Sandstrom, 442 U.S. at 514-27; In re Winship, 397 U.S. at 363-64. In support of its contention that "the instruction taken as a whole [did] not mislead the jury," the Miles court relied on one state court decision, State v. Schrock, 149 Ariz. 433, 440 (1986), and no federal law. Miles, 186 Ariz. at 15. The Arizona Supreme Court's decision in Schrock was based on the facts of that case. The court found that, given the evidence presented at trial, a misunderstanding of the law would not have made a difference to the outcome. The part of the instruction at issue (the relationship between co-defendants) concerned an aspect of felony murder irrelevant to the theory upon which the jury convicted the defendant. Schrock, 149 Ariz. at 440.*fn19
Likewise, as illustrated by its citation to Schrock, the Miles court answered the question of whether it was likely that the jury misunderstood felony murder law by looking at the facts of the case, finding that "[t]here is no doubt that the murder was 'in furtherance' of the robbery and kidnapping." Miles, 186 Ariz. at 15. The court failed to analyze how a reasonable juror might have interpreted the felony murder instruction and did not pay "careful attention to the words actually spoken to the jury," Sandstrom, 442 U.S. at 514 (citation omitted); see also Francis, 471 U.S. at 322 ("Language that merely contradicts and does not explain a constitutionally infirm instruction will not suffice to absolve the infirmity.").
 Moreover, the evidence the Miles court mustered in evaluating the instruction included facts that it should not have considered, namely evidence elicited at Jackson's aggravation/mitigation hearing rather than during Miles' trial. The Miles court cited to the facts outlined in its decision on Jack- son's direct appeal. Miles, 186 Ariz. at 12 (citing Jackson, 186 Ariz. at 20). But those facts came from the transcript of Hernandez's testimony at Jackson's aggravation/mitigation hearing. Jackson, 186 Ariz. at 23 (citing Tr. Jan. 19, 1994 at 44). Neither Jackson's nor Miles' jury heard this evidence, meaning this evidence should have had no bearing on evaluating the impact of an unconstitutional instruction.
 Finally, Jackson's and Miles' cases were factually different.*fn20 Jackson was only sixteen years old when the carjacking took place; Miles was twenty-four. The day after the carjacking, Miles left for Phoenix, driving Baeuerlen's car. The police apprehended him after a high-speed chase soon thereafter. In addition to Baeuerlen's car, they also found her ATM card, credit card, and personal effects in Miles' possession. Jackson, in contrast, stayed in Arizona and gave inconsistent accounts of the carjacking to a series of acquaintances. A witness saw Miles and Hernandez steal the gun used to kill Baeuerlen, while there was no forensic evidence to indicate that Jackson ever touched the weapon. As a result, the Miles and the Jackson juries likely had very different notions about whether their defendant was the protagonist in the carjacking or the shooter in the desert; the felony murder facilitation element may well have had a different resonance in Jackson's case.*fn21
C. Strickland and Richter
 Our conclusion that the felony murder instruction was unconstitutional does not end the ineffective assistance of trial or appellate counsel inquiry. See Strickland, 466 U.S. at 687-91. Nor does it mean that, to the extent that the state court's denial of Jackson's habeas petition was based on the conclusion that counsel's performance was adequate, that conclusion unreasonably applied clearly established Federal law. See Richter, 131 S. Ct. at 785 ("The pivotal question is whether the state court's application of the Strickland standard was unreasonable. This is different from asking whether defense counsel's performance fell below Strickland's standard.").
 As explained above, since the district court has not yet addressed these issues concerning counsel's performance, we remand the case. The district court will have to address the State's claim that Arizona law at the time of Jackson's trial would not have justified an objection, an issue that bears directly on the performance prong of Strickland.*fn22
 If the district court finds that counsel's performance was deficient and that it was unreasonable for the state court to find otherwise, then it must address whether counsel's error with respect to the instruction prejudiced Jackson and whether a contrary state court finding was unreasonable. See Richter, 131 S. Ct. at 785; Strickland, 466 U.S. at 691-96. In order for Jackson to prove prejudice, he "must show that there is a reasonable probability that, but for counsel's unprofessional errors, the result of the proceeding would have been different." Strickland, 466 U.S. at 694.*fn23
For the foregoing reasons, we conclude that the felony murder instruction provided to Jackson's jury was unconstitutional. We REMAND for further proceedings consistent with this opinion.