Tomorrow they'll hold arguments in
Madison v. Alabama. Now in his late 60s, the defendant in that case has been on death row in an Alabama prison for over thirty years. During that time he's sustained extensive brain damage from multiple strokes. He's also got dementia and long-term memory loss. If that weren't enough, he's also blind and can't ambulate on his own.
The issue is whether executing the guy would violate the Eighth Amendment's prohibition against cruel and unusual punishment because he doesn't understand why he's being executed.