OPINION
EAGEN, Chief Justice.On August 28, 1972, the appellant, Timothy Lynch, was convicted by a jury in Philadelphia of murder of the second degree. Following the imposition of sentence, an appeal was filed and argued by counsel in this Court. On January 24, 1974, we entered an order affirming the judgment of sentence. See Commonwealth v. Lynch, 455 Pa. 213, 314 A.2d 274 (1974).
In May, 1975, Lynch petitioned for habeas corpus in the United States District Court for the Eastern District of Pennsylvania. The petition was dismissed without conducting an evidentiary hearing on June 6, 1975.
*393On December 15, 1975, Lynch filed a petition in the Court of Common Pleas of Philadelphia seeking post-conviction relief pursuant to the Post Conviction Hearing Act, Act of January 25, 1966, P.L. (1965) 1580, § 1 et seq., 19 P.S. § 1180-1 et seq. (Supp.1977-78) [Hereinafter: P.C.H.A.], After a counseled hearing, relief was denied and the petition dismissed. This appeal is from that order.
At trial, the court instructed the jury that Lynch carried the burden of proving by a preponderance of the evidence his claim the killing was committed in self-defense. This was in accord with the law of Pennsylvania at the time. Commonwealth v. Winebrenner, 439 Pa. 73, 265 A.2d 108 (1970) [Hereinafter: Winebrenner]. Counsel objected to this instruction and requested the court charge Lynch carried no burden of proof. The court refused to do so. The propriety of this ruling was not raised on direct appeal.1 Lynch now argues the court’s ruling was erroneous in light of Commonwealth v. Rose, 457 Pa. 380, 321 A.2d 880 (1974) [Hereinafter: Rose ], and he should be granted a new trial.
Section 3(c) of the P.C.H.A. provides a petitioner is eligible for relief if, inter alia, his conviction or sentence resulted from:
“(12) [t]he abridgement ... of any right guaranteed by . the constitution ... of the United States, including a right that was not recognized as existing at the time of the trial if the constitution requires retrospective application of that right . . . .”
To determine if Lynch is entitled to relief under Section 3(c) requires a consideration of the development of the law in this area.
In Rose, we reversed the conviction and granted a new trial after disapproving a charge placing the burden of proving an intoxication defense on the accused. We based this ruling on state evidentiary grounds. In Commonwealth v. Cropper, 463 Pa. 529, 345 A.2d 645 (1975) [Hereinafter: Cropper], we affirmed the conviction but noted the court *394erred in charging the jury the accused had the burden of proving self-defense by a preponderance of the evidence. We grounded that conclusion on the new Crimes Code, 18 Pa.C.S.A. § 101 et seq., and avoided the question of whether Rose applied in the context of self-defense. But in Commonwealth v. Lesher, 473 Pa. 141, 147 n. 3, 373 A.2d 1088, 1091 n. 3 (1977) [Hereinafter: Lesher], we said: “there can now be little doubt Rose would have compelled the same conclusion” arrived at in Cropper. Thus, Lesher left little doubt that Rose overruled Winebrenner, wherein we rejected the argument that placing the burden of proving self-defense on an accused constitutes error. In Winebrenner, we considered our ruling in Commonwealth v. Bonomo, 396 Pa. 222, 151 A.2d 441 (1959) [Hereinafter: Bonomo], which disapproved placing the burden of proving alibi on an accused, and ruled Bonomo did not apply where the plea was self-defense.
In Commonwealth v. Hilbert, 476 Pa. 288, 382 A.2d 724 (1978) [Hereinafter: Hilbert], a “plurality” of this Court stated that placing the burden of proving self-defense on an accused charged with murder under Pennsylvania law prior to adoption of the new Crimes Code violates the accused’s federal constitutional right to due process of law2 as explained by Mullaney v. Wilbur, 421 U.S. 684, 95 S.Ct. 1881, 44 L.Ed.2d 508 (1975) [Hereinafter: Mullaney] and In re Winship, 397 U.S. 358, 90 S.Ct. 1068, 25 L.Ed.2d 368 (1970) [Hereinafter: Winship], Furthermore, Hankerson v. North Carolina, 432 U.S. 233, 97 S.Ct. 2339, 53 L.Ed.2d 306 (1977) [Hereinafter: Hankerson ], made it clear Mullaney is to be given “complete retroactive effect.”
*395Thus, while the decisions which disapproved placing the burden of proving self-defense on an accused, namely Cropper and Lesher, were made pursuant to state law, this disapproval was also compelled by the federal constitution since placing the burden of proving self-defense on an accused charged with murder under Pennsylvania law prior to the adoption of the new Crimes Code violates the accused’s federal constitutional right to due process of law. Hilbert, Mullaney, Winship. Furthermore, this must be given “complete retroactive effect” as was Hankerson.
The Commonwealth argues the issue is waived because Lynch failed to raise it on direct appeal or in his habeas corpus petition to the federal district court.
Section 3(d) of the P.C.H.A. provides a petitioner is eligible for relief only if “. . . the error resulting in his conviction and sentence has not been . . . waived.” Section 4(b) of the P.C.H.A. provides, inter alia:
“. . .an issue is waived if:
(1) The petitioner knowingly and understanding^ failed to raise it and it could have been raised ... on appeal [or] in a habeas corpus proceeding . . .”
Section 4(c) of the P.C.H.A. provides:
“There is a rebuttable presumption that a failure . to raise an issue is a knowing and understanding failure.”
In interpreting the P.C.H.A., we have said:
“[t]he overall import of a § 4 waiver is that a petitioner may not raise an issue in a Post Conviction Hearing Act proceeding if he has had any previous opportunity to raise the issue, but failed to do so, provided however that this failure was knowing and understanding and that there are no extraordinary circumstances attendant upon the failure to raise [the issue] ... It would be manifestly unfair to hold [a petitioner] to a waiver when this waiver is alleged to have occurred at a time when neither [petitioner] nor his attorney had any way of knowing that there existed a right to be waived.”
Commonwealth v. Cheeks, 429 Pa. 89, 95, 239 A.2d 793, 796 (1968).
*396Lynch’s direct appeal was filed on January 4, 1973, and disposed of on January 24, 1974. Both Bonomo and Winship were decided prior to that time and might be considered sufficient notice to Lynch and his attorney that the objection to the trial court’s instruction on the burden of proof had sufficient merit to warrant pursuing the objection post-trial. Cf. Commonwealth v. Humphrey, 473 Pa. 533, 375 A.2d 717 (1977).3 Indeed, those decisions may have triggered counsel’s objection at Lynch’s trial. But Winebrenner was decided subsequent to both of those decisions and, after consideration of Bonomo, Winebrenner rejected the argument that placing the burden of proving self-defense on an accused constituted reversible error. Furthermore, Rose was not decided until after final disposition of Lynch’s direct appeal. Under the circumstances, we are not disposed to rule that Lynch and his counsel failed to raise the issue “knowingly and understandingly.”4
The Commonwealth’s argument that the issue is waived for failing to raise it in the federal habeas corpus proceeding requires little discussion because the record does not show that Lynch was represented by counsel in that proceeding,5 and we have said that “waiver may be presumed only where the petitioner had counsel at the time the waiver allegedly occurred.” Commonwealth v. Mumford, 430 Pa. 451, 455, 243 A.2d 440, 442 (1968). [Emphasis in original.] See Commonwealth v. Smith, 461 Pa. 336, 336 A.2d 313 (1975); Commonwealth v. Haynes, 234 Pa.Super. *397556, 340 A.2d 462 (1975). Cf. Commonwealth v. Haywood, 441 Pa. 177, 272 A.2d 727 (1971).
The order of the Court of Common Pleas of Philadelphia is vacated, the judgment of sentence is reversed, and a new trial is granted.
POMEROY, J., joins in this opinion and filed a concurring opinion in which EAGEN, C. J., joins. NIX, J., concurs in the result.. Neither was the issue raised in Lynch’s habeas corpus petition.
. Mr. Justice O’Brien, speaking for himself and Mr. Justice Pomeroy, authored the opinion of the court. This writer filed a concurring opinion which is in accord with the above stated principle. Mr. Justice Roberts, in Commonwealth v. Ernst, 476 Pa. 102, 381 A.2d 1245 (1977) (opinion in support of reversal) [Hereinafter: Ernst], speaking for himself, Mr. Justice O’Brien, and Mr. Justice Manderino, stated Rose was “required by the United States Constitution.” Rose involved intoxication, but Lesher, prior to Ernst, had indicated Rose also applied in the context of self-defense. It follows that a majority of the Court has expressed a view which is in accord with the view of the plurality in Hilbert.
. There we held counsel ineffective for failing to object at trial to references to an accused’s silence under circumstances which should have made counsel aware that such an objection would raise an issue of arguable merit.
. We are not unmindful of the United States Supreme Court’s statement in Hankerson that the states may insulate past convictions through waiver rules. But as outlined above, waiver in the context of a constitutional right which is given retroactive effect must, under Pennsylvania law, be knowing and the failure to raise an issue regarding an unknown right can hardly be considered a knowing waiver.
. The district court’s docket entries do not indicate counsel entered an appearance.