Ronald Joseph DeFeo Jr. is an American mass murderer who 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. On November 21, 1975, De Feo was found guilty on six counts of second-degree murder and sentenced to 25 years to life.
About Ronald DeFeo Jr. in brief

In a 1986 interview for Newsday, De feo claimed his sister Dawn killed their father and then killed his mother, apparently with a 38-caliber Smith & Wesson revolver, because he was afraid to say anything about anything negative about his parents to his mother. He was the eldest son of the family and its lone surviving member. He is currently serving a 25-year sentence at a New York state prison for the murders. The victims were Ronald Jr.’s parents: and Louise DeFeO, née Brigante ; and his four siblings: Dawn, Allison, Marc, and John Matthew. The six victims were later buried in nearby Saint Charles Cemetery in Farmingdale. The police investigation concluded that the rifle had not been fitted with a sound suppressor and found evidence of sedatives having been administered. Physical evidence suggests that Louise deFeo and her daughter Allison were both awake at the. time of their deaths.
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