Inside the Mind of a Mass Murderer Ronald DeFeo's Motives

Dive into the chilling tale of the Amityville murders, exploring Ronald DeFeo's actions, the ensuing investigation, trial, and cultural ... On November 13, 1974, Ronald DeFeo Jr. of Long Island, NY killed his family in Amityville. His motive is still unclear 40 years later. Ronald DeFeo Jr. was the perpetrator of a notorious mass murder that took place on November 13, 1974, in Amityville, New York. Find out all there is to know about the DeFeo family murders, which inspired the scary movie "The Amityville Horror." DeFeo was convicted in the 1974 killings of his parents and four siblings in a Long Island home that became the basis of a horror-movie classic. DeFeo Jr. was a convicted murderer who gained notoriety for the 1974 murders of six members of his family at their home in Amityville, New York. Ronald DeFeo, 69, was convicted of killing his parents and four siblings at the family's Amityville home in 1974, a grisly tale that became ... Ronald DeFeo, 69, died Friday at Albany Medical Center, where he was taken Feb. 2 from a prison in New York's Catskill Mountains. DeFeo Jr. was convicted in the shooting deaths of his parents, two sisters and two brothers inside their home in 1974. Ronald DeFeo Jr., who shot and killed his parents and four siblings in their Amityville, Long Island, home, died Friday at the Sullivan Correctional Facility.