- Given six concurrent life terms for the slaying of his parents Ronald DeFeo Sr. (43) and Louise DeFeo (42) and his siblings John (9), Marc (12), Allison (13) and Dawn DeFeo (18) at their residence on 112 Ocean Avenue in Amityville, New York on November 13, 1974, while they slept. These murders were the "basis" for "The Amityville Horror".
- Later supposedly became a business partner with his defense attorney William Weber, in a bid to make a financial profit from the events surrounding the murders.
- Following his arrest in 1974, he claimed in his official testimony that he had heard a disembodied voice telling him to murder his family, though after much deliberation it was later revealed the claim was merely a ploy, as a part of an insanity defense plea led by his defense attorney William Weber.
- The murdered members of the DeFeo family are buried at Saint Charles Cemetery in Farmingdale, Suffolk County, New York.
- Remanded at the Green Haven Correctional Facility for the infamous Amityville Murders.
- Son of Ronald DeFeo Sr. (1930-1974) and Louise DeFeo (1931-1974).
- Older brother of Dawn DeFeo (1956-1974); Allison DeFeo (1961- 1974); Marc DeFeo (1962-1974) and John Matthew DeFeo (1965-1974).
- Claimed he had heard voices coming from within his home in Amityville telling him to murder his family.
- Letters and various psychiatric documents exist showing him to be a different character from that of the Monster, as publicized in movies, books and texts.
- Remained optimistic that he would one day be released from custody, despite failing at all of his previous parole boards.
- He claimed that his sister Dawn DeFeo played a key part in the murders, and called for three such crimes to be taken into consideration.
- Attended St. Martin of Tours Church at 35 Union Ave. in Amityville.
- Grandnephew of Peter DeFeo.
- He had Italian heritage.
- Nephew of Michael Brigante Jr, Phyllis Procita and Vincent Procita.
- Friend of John Carswell, Frank Davidge and Bobby Geiger.
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