State v. Wilcox
Supreme Court of Ohio
70 Ohio St.2d 182 (1982)
Wilcox (defendant), diagnosed with schizophrenia and organic brain syndrome by a court-appointed psychiatrist but found competent to stand trial, was involved in a burglary during which a person was shot and killed. He pleaded not guilty by reason of insanity and introduced psychiatric evidence of his mental illness, but the trial court refused to permit additional psychiatric testimony or jury instructions on a separate diminished-capacity theory that his mental condition prevented him from forming the specific intent required for aggravated murder or burglary. He was convicted and appealed.
Whether the diminished-capacity defense should be available in jurisdictions that do not adhere to the M'Naghten standard of insanity.