Not Psycho or The Texas Chain Saw Massacre but a secret third thing. From wiki: "Deranged (also known as Deranged: Confessions of a Necrophile)[2] is a 1974 Canadian psychological horror film directed by Alan Ormsby and Jeff Gillen, and starring Roberts Blossom. Its plot, loosely based on the crimes of Ed Gein,[3] follows Ezra Cobb, a middle-aged man in a rural Midwestern community who begins a string of serial murders and grave robberies after the death of his mother Amanda, a religious fana...