A CRIME STEPHEN KING COULD NOT INVENT. Davis teen Daniel Marsh grows fond of sadistic violence and torture. He believes there are too many people in the world, and that serial killers can help solve this problem. He wants to be like them. On April 14, 2013, he murders Oliver "Chip" Northup, 87, and Claudia Maupin, 76, in a way that, as Davis police said, showed "exceptional depravity." He carefully covers his tracks but talks up the crime to friends. In a five-hour confession he tells police it "felt great" to kill the couple. He pleads not guilty and seeks to have the confession tossed. When that fails, he pleads insanity. He wants to get away with murder, by any means necessary. Lloyd Billingsley attended every day of the trial. Exceptional Depravity: Dan Who Likes Dark and Double Murder in Davis, California explains how it all happened, why it happened, and what it means.