Ronald Joseph “Butch” DeFeo Jr. (born September 26, 1951) is an American mass murderer. He was tried and convicted for the 1974 killings of his father, mother, two brothers, and two sisters. The case inspired the book and film versions of The Amityville Horror. DeFeo’s trial began on October 14, 1975. He and his defense lawyer William Weber mounted an affirmative defense of insanity,

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