FALLSBURG, N.Y. -- Ronald DeFeo Jr., who was convicted of slaughtering his parents and four siblings in a home that later inspired the "The Amityville Horror" book and movies, has died, prison officials said Monday. DeFeo, 69, died Friday at Albany Medical Center, where he was taken Feb. 2 from a prison in New York's Catskill Mountains, the state Department of Corrections and Community Services said. The cause of his death wasn't immediately known. DeFeo was serving a sentence of 25 years to life in the 1974 killings of his father, mother, two brothers, and two sisters in their Suffolk County home. The home became the basis of a horror-movie classic after another family briefly lived there about a year after the killings and claimed the house was haunted. A book and two movies - the 1979 original, starring James Brolin, Margot Kidder and Rod Steiger, and a 2005 remake - portrayed a home with strange voices, walls that oozed slime, furniture that moved on its own, and other supernatural features.