A notorious Canadian serial killer who allegedly fed his victims to his pigs was fatally assaulted by a fellow inmate at the maximum-security prison where he was serving a life sentence. Robert “Willie” Pickton, 74, died of injuries inflicted on May 19 in the Port-Cartier Institution in Quebec, the Correctional Service of Canada said in a statement Friday. An unidentified 51-year-old inmate is reportedly suspected in the attack. Pickton was convicted in 2007 of murdering six women and butchering their remains at his pig farm in the western province of British Columbia, according to Reuters. He…