Here is a small section of Pasolini's Autobiography concerning "Salo":
However, his next film, 1975's Salo, o le Centoventi Giornate di Sodoma, was in many respects the most disturbing of all of his films. An adaptation of the de Sade novel set at the tail end of World War II, it depicted the atrocities suffered by a group of kidnapped boys and girls at the hands of their Nazi captors. Deemed one of the most disquieting motion pictures ever filmed, Salo was Pasolini's final work. On November 2, 1975, he was brutally murdered. After bludgeoning the director to death, his killer then repeatedly drove over the corpse in Pasolini's own Alfa Romeo. While the murderer was later speculated to be a male prostitute — one of the many street dwellers whose kind Pasolini brought to the screen with so much conviction — speculation on the mysteries of his demise continue to run rampant, and it has been noted that his death served as a tragically appropriate coda to his art. — Jason Ankeny