Mors initially used arsenic, opium, and morphine to poison his victims, but he decided to invent a new method of poisoning that wouldn’t leave any evidence. Since Majors had been seen alone with these victims shortly before their deaths, he was found guilty of all charges and received a life sentence. After Snow’s death made the news, Stella Nickell came forward to report that her husband died under similar circumstances, leading authorities to believe an unknown party was poisoning Excedrin pills.