Not Human

A prisoner, Marty, who's had many run-ins with the law and many psychiatric visits with Doctor Bilsom has finally flipped. He's massacred people in broad daylight, caught and sentenced to the death penalty. But, because the prisoner's lawyer thinks Marty is more on the borderline of having mental problems, asks the judge to order a visit with Marty's psychiatrist. An appeal to avoid the death sentence, but something more than just the visit explains what really is making Marty kill innocent lives.