Liverpool-born serial killer John Sweeney has died in prison. The double murderer was known as the Canal Killer after he killed and dismembered former girlfriends. Sweeney disposed of the victims' remains in canals.
He died behind bars without revealing key details about his crimes. Sweeney never disclosed what he did with his partners' heads before he died. The killer also passed away without revealing whether he had more victims. The location of the victims' heads and the total number of his victims remain unknown following his death behind bars.