Mass murderer who shot his mother, father, and four siblings while they lay sleeping, and was inspiration for the film and book The Amityville Horror.
He worked at his grandfather's car dealership.
He pleaded insanity, but was found guilty of the murders and sentenced to 6 separate sentences of life in prison.
He was the son of Ronald DeFeo, Sr. and Louise DeFeo. He claimed he heard the voices of his family plotting against him and so he killed them in their sleep.
Actor Ryan Reynolds starred in the 2005 film The Amityville Horror, based on the book about the killings.