PHOENIX -- The gunmen took turns as they drove around the city. Some nights it was Samuel John Dieteman, a burly electrician with a ragged mop of jet black hair. According to court documents, he'd blast at lone pedestrians from the window of a silver Toyota Camry in what he called "random recreational violence." Other nights the trigger was pulled by his roommate, Dale S. Hausner, a baby-faced janitor and freelance photographer, the court documents allege. After each shooting, the pair would drive slowly away, leaving little evidence other than the victim's body on a sidewalk. Court documents and interviews...