British Columbia\'s Ministry of Justice issued a final report Wednesday confirming actor Cory Monteith died of an accidental heroin overdose. The \"Glee\" star was found dead in a Vancouver hotel room July 13, 20013. He was 31. Billboard.com quoted the B.C. coroner\'s report as saying Monteith died of a mixed drug cocktail involving \"intravenous heroin use combined with the ingestion of alcohol.\" The report also noted investigators on the scene discovered \"a spoon with drug residue and a used hypodermic needle, along with two empty champagne bottles and glasses\" when they entered Monteith\'s room after he did not check out of the hotel as scheduled.