A Day with Bill Bonin (Serial Killer William G. Bonin's VILE Murders) [1980]

Odd character Bill Bonin (also known as William G. Bonin) and teenage accomplice Gregory Matthews Miley were driving along Santa Monica Boulevard when they picked up an underaged teenager for deviant purposes. Bill decides this one will die, and tells Miley about it. After brutalizing the young man, they decide to hunt for another victim. They find a 12 year-old child named James McCabe, who they brutalize, and discard near a dumpster in Walnut City.