Vancouver Police Department report, released Tuesday afternoon stated that "there were indications in the room that this was a drug overdose."
The Glee actor was born in Calgary, in Alberta province, but he grew up in Victoria.
According to Police briefing, that "they believe Monteith had been dead for several hours before he was found. They said the coroner's report didn't indicate the levels of heroin or alcohol in his system. They ruled out foul play."
Last April, Cory had voluntarily submit himself into rehabilitation to deal with substance-abuse issues, he acknowledged struggling with since his teenage years.
Cory Monteith died at age 31 in a most-tragic accident.
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