Missouri is set to execute a man diagnosed as mentally ill and disabled, unless the state’s highest court ends its long-standing refusal to intervene. Cecil Clayton is missing one-fifth of his frontal lobe as a result of an accident at a lumberyard where he worked. Years after the injury, he was arrested for killing a police officer and sentenced to death despite his apparent confusion over the crime. Psychologists have repeatedly concluded Clayton’s execution would violate the Constitution’s ban on executing insane or intellectually disabled people. But the Missouri Supreme Court has refused six times to hold a hearing the case; unless they change course, he will die today at 6 p.m. CDT.