Deranged is a Canadian-American made in 1974 and directed Alan Ormsby and Jeff Gillen Is is also known by the title Deranged: The Confessions of a Nerrophile in the USA It is a low-budget movie that has since become something of a cult film and is based on the life of Ed Gein The title is however misleading since Ed Gein never experimented with necrofilia although a necrophile is also defined as na obsessive fascination with death and corpses.
The movie disappeard after its release in 1974 and was later rediscovered in Florida in the mid 1990s.