Coroner's report confirms cause of death for 'Glee' star Cory Monteith Actress Jane Lynch delivers remarks for a memoriam for actor Cory Monteith at the 65th annual Primetime Emmy Awards at Nokia Theatre in Los Angeles on September 22, 2013. VANCOUVER, British Columbia, Oct. 2 (UPI) -- 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.