"Missouri Executes Inmate Who Had Part Of His Brain Removed"

A useful breakdown of what happened to those sentenced to die in recent years. Only a fraction were executed. As seen in comments, it is debatable what this means. The subject article discusses the execution of a cop killer in his 70s. Four justices opposed the execution without saying why. This is simply wrong. We are told that judges show their work. If 4/9 of the US Supreme Court says an execution should not go on, I want to know why.