Yesterday afternoon, officials in Vancouver confirmed what many suspected, that Cory Monteith died of a drug overdose. I'm not sure how many people expected it to be heroin. I'm pretty sure most people expected it to be some kind of pill and that his death would be similar to so many other celebrities that have accidentally overdosed. Two separate lives for Cory Monteith. While in Los Angeles, he apparently was a very hard worker who was going to AA meetings and appeared to be sober. I say appeared because if you are hooked on heroin, then you need heroin. This is not something you just do once a month and that is all you need. Maybe in Los Angeles with work commitments and friends and responsibilities he was better at covering it up or not using as much, but he had to have been using. Police in Vancouver would not say if heroin was found in his hotel room, just that what they found was consistent with a drug overdose. So, yes they found drugs.
Source:
http://www.crazydaysandnights.net/2013/07/cory-monteith-dies-of-heroin-and.html