Whether a capital habeas petitioner who cannot overcome a procedural default, abuse of the writ, or successive-petition bar may invoke the fundamental-miscarriage-of-justice exception by showing that additional mitigating evidence might have led the sentencer to choose life rather than death.
Holding
No. Actual innocence of the death penalty concerns eligibility for death under state law, not the sentencer's discretionary weighing of additional mitigating evidence.
Reasoning
Federal habeas doctrine generally bars merits review of procedurally defaulted, abusive, and successive claims unless the petitioner shows cause and prejudice. A narrow fundamental-miscarriage-of-justice exception remains available in extraordinary cases, but it must be defined by relatively objective standards that preserve finality and can be applied quickly, including when late-filed capital petitions seek a stay of execution.
Capital sentencing has two distinct stages. First, state law narrows the class of defendants eligible for death through the definition of the capital offense and statutory aggravating circumstances. Once eligibility is established, the sentencer makes an individualized and discretionary choice between death and life while considering aggravating and mitigating evidence. The Court concluded that the actual-innocence inquiry properly tracks the first, eligibility-based stage.
The Court rejected the State's proposed rule limiting actual innocence to innocence of the capital offense itself, because prior precedent recognized that a petitioner could be innocent of the death penalty even if guilty of capital murder. But the Court also rejected Sawyer's broader rule, which would include omitted mitigating evidence and ask whether there was a fair probability that death resulted from a constitutionally inaccurate sentencing profile.
Treating omitted mitigating evidence as actual innocence would largely duplicate the ordinary prejudice inquiry required to obtain habeas relief for many constitutional errors. It would allow a petitioner to avoid the cause requirement by relabeling prejudice as actual innocence, contrary to the narrow and exceptional character of the miscarriage-of-justice gateway.
An eligibility rule is also more administrable. A court can comparatively assess whether evidence negates an objective element, such as intent or a statutory aggravator. Predicting how a jury would have weighed a broad range of character, background, and mitigation evidence in its discretionary moral judgment is substantially less objective and would expand the exception beyond its intended limits.