How sick is too sick to be executed?

The Supreme Court last week agreed to hear a death penalty case that hinges on a fine point. The court has ruled in the past that it is unconstitutional to execute people who can’t understand why they face death at the hands of the state — usually people with mental illnesses or diminished intellectual abilities. Vernon Madison, who killed a Mobile, Ala., police officer in 1985, knows the state intends to execute him for committing a murder, but a series of strokes and other ailments have left him incontinent, barely able to walk and unable to recall the crime itself. So the question for the court is whether it is acceptable to execute someone who knows he was convicted of murder but can’t remember what he did.