Ronald Joseph DeFeo Jr. was an American mass murderer who was tried and convicted for the 1974 killings of his father, mother, two brothers, and two sisters in Amityville, New York. Sentenced to six counts of 25 years to life, DeFeo died in prison on March 12, 2021.
Biography from Wikipedia, CC BY-SA. Credits and photos from TMDB.

as Oldest and killer of the DeFeo family
The people who keep turning up in Ronald’s titles.