Opinion of the Court
ruling that he could still be executed, the Panetti Court set out the appropriate “standard for competency.” Id., at 957. Ford, the Court now noted, had not provided “specific criteria.” 551 U. S., at 957. But Ford had explored what lay behind the Eighth Amendment’s prohibition, highlighting that the execution of a prisoner who cannot comprehend the reasons for his punishment offends moral values and “serves no retributive purpose.” 551 U. S., at 958. Those principles, the Panetti Court explained, indicate how to identify prisoners whom the State may not execute. The critical question is whether a “prisoner’s mental state is so distorted by a mental illness” that he lacks a “rational understanding” of “the State’s rationale for [his] execution.” Id., at 958–959. Or similarly put, the issue is whether a “prisoner’s concept of reality” is “so impair[ed]” that he cannot grasp the execution’s “meaning and purpose” or the “link between [his] crime and its punishment.” Id., at 958, 960.
B
Vernon Madison killed a police officer in 1985 during a domestic dispute. An Alabama jury found him guilty of capital murder, and the trial court sentenced him to death. He has spent most of the ensuing decades on the State’s death row.
In recent years, Madison’s mental condition has sharply deteriorated. Madison suffered a series of strokes, including major ones in 2015 and 2016. See Tr. 19, 46–47 (Apr. 14, 2016). He was diagnosed as having vascular dementia, with attendant disorientation and confusion, cognitive impairment, and memory loss. See id., at 19–20, 52–54. In particular, Madison claims that he can no longer recollect committing the crime for which he has been sentenced to die. See Tr., Pet. Exh. 2, p. 8.
After his 2016 stroke, Madison petitioned the trial court for a stay of execution on the ground that he had become
