OPINION OF THE COURT
This case illustrates the complexity engendered by the current federal habeas
*88
corpus doctrine of procedural default. In his petition for writ of habeas corpus, Larry Gene Hull contends he received ineffective assistance of counsel in a state court competency hearing before he pled guilty to murder. In an earlier opinion, we held the performance of Hull’s counsel at that hearing fell below an objective standard of reasonableness, fulfilling the first of two elements of an ineffective assistance of counsel claim under
Strickland v. Washington,
In reaching the merits of Hull’s petition in Hull I, we first considered whether Hull had procedurally defaulted his state post-conviction claim by his untimely appeal to the Pennsylvania Supreme Court. After the Pennsylvania Superior Court denied Hull’s state post-conviction claim on the merits, Hull’s post-conviction counsel did not file a petition for permission to appeal to the Pennsylvania Supreme Court because he thought an appeal lacked merit. Because counsel did not notify Hull in time for Hull to comply with the filing deadline, Hull filed a pro se petition three months out of time. The Pennsylvania Supreme Court denied the petition without comment.
In
Hull
I, we held this denial did not constitute a ruling based on procedural default barring federal habeas review.
Hull asserts the “cause” for his untimely post-conviction appeal to the Pennsylvania Supreme Court was his counsel’s failure to file the appeal, and his failure to notify Hull of this until after the deadline had passed. As we explain, Hull’s post-conviction counsel’s failure to file the appeal cannot constitute “cause” as a matter of federal law. Therefore, Hull can only obtain federal habeas review if the Pennsylvania Supreme Court decides to waive his procedural default and hear the merits of his claim.
If post-conviction counsel’s conduct amounts to ineffective assistance of counsel under Pennsylvania law, it would constitute a basis for such a waiver, which would entitle Hull to a determination on the merits of his state post-conviction claim by the Pennsylvania Supreme Court.
Commonwealth v. West,
Hull has never presented to state court his claim that post-conviction counsel provided ineffective assistance in failing to file a petition for allowance to appeal to the Pennsylvania Supreme Court. Because we believe this is a colorable claim, we will vacate the district court’s order denying Hull’s petition and direct that court to enter an order dismissing Hull’s petition without prejudice to enable him to file a state post-conviction petition asserting this claim.
I.
In
Hull
I, we determined that Hull’s failure to file a timely petition for allocatur
1
and subsequent petition for allocatur
*89
nunc pro tunc
with the Pennsylvania Supreme Court following the Pennsylvania Superior Court’s affirmance of denial of his state post-conviction claim constituted a state procedural default.
In two 1991 decisions, the Supreme Court limited the
Harris
presumption we applied in
Hull
I — that a state court’s denial of a habeas petition rests on a procedural default only where it “clearly and expressly” so states. In
Coleman v. Thompson,
— U.S. -, -,
We applied
Coleman
and
Ylst
to affirm the dismissal of a habeas corpus petition for state procedural default in
Caswell v. Ryan,
Applying
Coleman
and
Ylst,
we found the Pennsylvania Supreme Court’s unexplained denial of Caswell’s claim was based on his procedural default, not on the merits.
Caswell,
We then considered whether Caswell had established the requisite cause and prejudice to excuse his procedural default and obtain federal habeas review. To establish cause, Caswell contended only that the Pennsylvania Supreme Court should not have held him to “strict compliance” with its procedural rules and should have “liberally constru[ed] his petition for appointment of counsel to file a petition for alloca-tur.”
II.
As a threshold matter, we believe we must apply
Coleman
and
Ylst
to Hull’s petition, although these decisions were handed down after our decision in
Hull
I. Judicial decisions normally are retroactively applied.
Goodman v. Lukens Steel,
The result is not different where, as here,
Hull
I previously decided the issue of procedural default in Hull’s favor. Relitigation of issues previously determined in the same litigation is controlled by principles of the law of the case doctrine rather than collateral estoppel. 18 Charles A. Wright, Arthur R. Miller, and Edward R. Cooper,
Federal Practice and Procedure: Jurisdiction
§ 4478, at 788 (1981). An intervening change in controlling law is an exception to the law of the case doctrine.
Zichy v. City of Philadelphia,
III.
A.
We now consider whether Coleman, Ylst, and Caswell permit us to reach the merits of Hull’s claim. We read these decisions to compel the conclusion that the Pennsylvania Supreme Court’s denial without comment of Hull’s untimely appeal of his state petition was based on procedural default. As in Caswell, application of the *91 Ylst “look through” approach reveals that the Pennsylvania Superior Court’s denial of Hull’s petition was on thq merits, creating the presumption that the Pennsylvania Supreme Court’s unexplained denial of his petition was also on the merits. But the reasoning employed in Caswell to find the Ylst presumption rebutted also applies here. Hull’s appeal, filed three months after the 30-day time limit expired, was less untimely than Caswell’s fifteen-month-late appeal. But we believe three months is also “plainly out of time” within the meaning of Ylst. We see no principled way to distinguish between a three- and a fifteen-month delay. The second aspect of Caswell's analysis — that the Pennsylvania Supreme Court ordinarily does not waive the timeliness requirement without saying so — also applies to Hull’s appeal, which, like Caswell’s, was filed with that court. Therefore, we find the Ylst presumption rebutted here, and now turn to the question whether Hull has established cause and prejudice for his procedural default. 3
B.
The Supreme Court has defined “cause” as “some objective factor external to the defense.”
Murray v. Carrier, 477
U.S. 478, 488,
Hull asserts that several facts establish “cause” for his default. Hull notes post-conviction counsel never notified him counsel would not file a petition for allocatur until after the 30-day appeal period elapsed. Hull was particularly reliant upon counsel to file his appeal, and to advise him of the deadline, because he is illiterate and had been diagnosed as borderline mentally retarded. However, we do not believe these circumstances can establish “cause.” Under
Coleman,
ineffective assistance of post-conviction counsel cannot constitute “cause” because the Sixth Amendment does not entitle a defendant to post-conviction counsel. — U.S. at-,
Nonetheless, we believe Hull’s mental deficiencies, combined with post-conviction counsel’s failure to file the appeal and failure to notify Hull until after the deadline passed, create a colorable claim for waiver under Pennsylvania law.
Commonwealth v. West,
Hull’s mental deficiencies, and lack of notice from counsel on the appeal deadline, distinguish this case from
Caswell.
Unlike Hull, Caswell not only had notice of the thirty-day deadline, he took several affirmative steps to comply with it. He wrote to appellate counsel asking him to petition for allocatur six days after the Pennsylvania Superior Court denied his claim.
Caswell’s correspondence reveals another significant difference, his “ample legal sophistication.”
The distinctions between
Caswell
and this case are borne out in the Pennsylvania decisions. In upholding an ineffective assistance of counsel claim based on counsel’s failure to file an appeal and to notify defendant of this failure in
Commonwealth v. West,
the court distinguished its earlier decision in
Commonwealth v. Morrow,
These Pennsylvania decisions not only support the distinction between this case and Caswell, they also suggest Hull’s claim of ineffective assistance of post-conviction counsel has some merit. Like West, Hull petitioned pro se for allocatur, thus demonstrating his desire to appeal, and unlike Morrow, Hull alleged he was unaware of his right to petition for allocatur at the time the deadline passed.
We hold that where a petitioner has raised a colorable claim for waiver of procedural default under state law, we should dismiss his habeas petition without prejudice so he can assert this claim in state court. We note this is not a case where petitioner has abused his right to federal habeas by withholding a state law claim from an earlier petition.
Cf. McCleskey v. Zant,
— U.S.-, -,
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We took this approach in
Bond v. Fulcomer,
Both Hull and the District Attorney contend we should follow
Bond
here. We agree. As in
Bond,
Hull asserts his failure to file a timely petition for allocatur resulted from counsel’s decision that a petition would not be worthwhile, coupled with counsel’s failure to notify Hull of this refusal until after the 30-day appeal period had elapsed. Because under
Coleman
ineffective assistance of post-conviction counsel does not constitute “cause” for Hull’s procedural default as. a matter of federal law, — U.S. at-,
Accordingly, we will dismiss Hull’s petition without prejudice so he may file a state post-conviction petition to assert his claim of ineffective assistance of post-conviction counsel as a ground for his untimely petition for allocatur on his ineffective assistance of trial counsel claim. If the Pennsylvania Supreme Court rejects Hull’s ineffective assistance of post-conviction counsel claim, we presume it will deny his petition for permission to appeal
nunc pro tunc
on this basis. It will then have ruled based on procedural default and, under
Coleman,
Hull will be barred from federal habeas review because he cannot rely on his ineffective assistance of post-conviction counsel to establish “cause” as a matter of federal law for this procedural default.
Coleman,
— U.S. at -,
By contrast, if the Pennsylvania Supreme Court upholds Hull’s ineffective assistance of post-conviction counsel claim, we presume it will grant his petition for permission to appeal nunc pro tunc on his ineffective assistance of trial counsel claim. The court will then either deny or grant Hull’s petition for allocatur on his ineffective assistance of trial counsel claim. In either scenario, the court will be considered to have reached the merits of Hull's ineffective assistance of trial counsel claim, and thus to have waived his procedural default with respect to this claim. If the Pennsylvania Supreme Court grants Hull’s petition for allocatur, it will in fact reach the merits of the ineffective assistance of *94 trial counsel claim. If the court denies Hull’s petition for allocatur, it will be deemed, under the Ylst “look-through” rule, to have decided the ineffective assistance of trial counsel claim on the same ground as the Pennsylvania Superior Court, which rejected it on the merits. 5 Thus, in either event, Hull will have obtained a determination on the merits of his ineffective assistance of trial counsel claim by the Pennsylvania Supreme Court, and, necessarily, a ruling by that court that it waived Hull’s procedural default of this claim on the ground he received ineffective assistance of post-conviction counsel.
If the Pennsylvania Supreme Court denies Hull’s ineffective assistance of trial counsel claim either by denying allocatur or by granting allocatur and rejecting it on the merits, he may re-file his federal habe-as petition.
Bond,
IV.
For the foregoing reasons, we will vacate the district court’s order and direct that court to enter an order dismissing the petition without prejudice.
Notes
. “Allocatur” is synonymous with “allowance of appeal," which is the official term used for petitions to the Pennsylvania Supreme Court. 42 Pa.Cons.Stat.Ann. § 724 (1992).
. We note that
Harris v. Reed,
the case upon which we relied in deciding
Hull
I, has been held to apply retroactively in a habeas case, on the ground that it is not a constitutional rule and thus falls outside the rule that new constitutional rules do not apply in habeas cases.
Peterson v. Scully,
. Failure to hear Hull’s claims would not fall within the "fundamental miscarriage of justice" exception to the procedural default rule. That exception "is concerned with actual as compared to legal innocence,"
Sawyer v. Whitley,
— U.S. -, -,
. In requiring Hull to present his claim of ineffective assistance of post-conviction counsel first to state court, we hold only that this claim is unexhausted because it has never been presented to state court. This does not affect our earlier holding that, by filing a
nunc pro tunc
petition in pursuit of his underlying claim that he received ineffective assistance from his trial counsel, Hull exhausted his state remedies as to this claim.
Hull
I,
. Although we recognize the denial of allocatur has no precedential value under Pennsylvania law,
Bond v. Gallen,
. The only risk presented by this procedure is that the Pennsylvania Supreme Court will deny Hull’s nunc pro tunc petition without comment, in which case our decision will have placed Hull into an enclosed loop from which he cannot escape. This outcome is, of course, in the hands of the Pennsylvania Supreme Court, but just as we have looked to principles of comity in deciding this case, we expect that court will do likewise. Our approach here should signal the problems resulting from an unexplained order and should reduce the significant drain on both the state and federal court systems presently caused by threshold questions of habeas corpus law.
