Stefano Ganci died in the prison wing of a Parma hospital in late December, Italian police said on Wednesday. Ganci, 55, reportedly died of a heart attack. The trusted killer of Totò Riina, was serving life in the Emilian city. Among his victims were top Sicilian judge Rocco Chinnici, and deputy Palermo police chief Ninni Cassarà. He was also part of the Cosa Nostra hit squad that blew up magistrate Paolo Borsellino.