Not long after Robert Spangler learned he was dying of cancer, detectives came knocking at his door on the chance he had something he might want to get off his chest before the end came. And he didn’t disappoint them… Spangler matter-of-factly admitted killing his family in 1978 and pushing his third wife, Donna, to her death at the Grand Canyon 15 years later. The death of his second wife, Sharon, was ruled as suicide and was never investigated. Death, it seems, had always been an “easy wa...