Late Glee star Cory Monteith passed away at the age of 31 within a Vancouver, Canada hotel room. His passing on July 13, 2013 allowed room for speculation until recently when an official coroner's report released October 2 confirmed the actor's death was "accidental" and "mixed drug toxicity, involving intravenous heroin use combined with the ingestion of alcohol" were at blame.
The man who played the beloved Finn on Glee was found dead in his hotel room by hotel staff with "a spoon with drug residue and a used hypodermic needle, along with two empty champagne bottles and glasses" per the British Columbia Coroners Service. The report also offered that Monteith's background including a "history of illicit drug use with intermittent periods of rehabilitation and abstinence from drugs. The periods of abstinence ranged from years to months in duration" and that following abstinence, a user's "previously tolerated drug concentration level may become toxic and fatal."
For more about his death, read the official report here