Dunn v. Madison,  No. 17-193, 583 U.S. ___ (November 6, 2017).

Madison sought relief from execution because several strokes made it impossible for him to recall the crime for which he faced the death penalty. Experts found that he had lost some capacities as a result of strokes, Madison understood he had been convicted of a crime and had been sentenced to death.

The Supreme Court denied relief.  The Court observed that it is well established that it would violate the Eighth Amendment to execute anyone who lacked capacity to understand the nature of the proceedings.  Here, however, execution would not offend the Constitution because, although Madison lost event-specific memory, Madison knew he had been convicted and faced execution.  

Dunn v Madison 17-193 2017 11 06