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Ronald Joseph DeFeo Jr. (September 26, 1951 – March 12, 2021) was an American mass murderer who was tried and convicted for the 1974 killings of his father, mother, two brothers, and two sisters in Amityville, Long Island, New York. Condemned to six sentences of 25 years to life, DeFeo died in custody in 2021. The case inspired the book and film versions of The Amityville Horror.
