Glee actor Cory Monteith, 31, was found dead on Saturday evening at a Vancouver hotel. A rep for for the late star said that they are in shock over this tragic news. Monteith recently returned from a short stint in rehab for drug abuse, a disease he has battled with for years. He was dating his co-star Lea Michele. UPDATE: I have recently been notified that Cory Monteith died from "mixed drug toxicity" of heroin and alcohol, said the British Columbia coroner.