Ronald ("Butch") DeFeo, Jr. (born September 26, 1951) was tried and
convicted of murder in 1974 of his father, mother, two brothers and two
sisters. The case is notable for being the reallife inspiration behind the
book and film versions of The Amityville Horror
The murder of family
Around 6:30 pm on November 13, 1974, 23 years old, Ronald DeFeo, Jr. broke into Henry's Bar inAmityville, Long Island, New York and declared: "You gotta help me! I think my mother and father are shot! " DeFeo and a small group of people came to 112 Ocean Avenue, which was located not far from thebar, and found that DeFeo's parents were really dead. One of the group, Joe Yeswit, made an emergency call to the Suffolk County Police, who searched the house and found that six members of one familywere killed in their beds.
The car dealer victims were Ronald DeFeo, Sr. (43), Louise DeFeo (42), and four of his children: Alba (18), Allison (13), Marc (12) and Juan Mateo (9). All thevictims were shot with a .35-caliber lever action Marlin rifle 336C  around three in the morning of that day. DeFeo parents had been shot twice, while the children were all killed by singleshots. Louise DeFeo and her daughter Allison would have been the only victims who were awakened by gunfire at the time of his death,  but, according to the Suffolk County Police victims were found lying ontheir stomachs in bed. The DeFeo family had occupied 112 Ocean Avenue since purchasing in 1965. Killed members of the DeFeo family are buried in nearby St. Charles Cemetery in Farmingdale. 
RonaldDeFeo, Jr., eldest son of the family, and was also known as "Butch". He was taken to the local police station for his own protection after suggesting to police at the scene of the crime that thekillings had been carried out by a mob hit man named Louis Falini. However, an interview at the station before DeFeo exposed serious inconsistencies in his version of events, and the next day he...