'Glee' Star Found Dead in Hotel Room

Outpouring of sadness from colleagues, fans following mysterious death.
1:48 | 07/14/13

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Transcript for 'Glee' Star Found Dead in Hotel Room
tonight, the death of actor cory monteith. Millions know him for his starring role in the musical tv series "glee." Behind the scenes, a less cheerful story. This evening, an outpouring of sad frns his fans. Here is abc's linzie janis. ♪ They can share the night ♪ ♪ it goes on and on and on ♪ Reporter: Cory monteith, playing his breakthrough role, high school football star turned singing heartthrob in the fox hit series "glee." I have really great leadership skills. The 31 actor was found dead in his hotel room saturday morning. Police saying the cause of death was not immediately apparent, but is ruled out foul play. An autopsy is scheduled for tomorrow. The actor has been open about his life-long battle with substance abuse which started at the age of 13. In an interview, he described his drug use by age 16, anything and everything, as much as possible. I had a serious problem. In april, he checked himself in for treatment. His girlfriend both on and off the screen, lea michele saying at the time she was proud of him. ♪ Still here we are, both of us lonely ♪ Reporter: Costars friends and fan took to twitter to express their grief. We've always known we're special. Mark who played one of his best friends, puck, on glee, simply said no. Dot-marie jones tweeted my heart is broken. And john stamos, a glee guest star saying we talked about how lucky he felt to be alive and sober. We talked about playing drums. Glad I knew you, cory. The community here in hollywood is in mourning. Producers of glee said monteith was an exceptional performer and even more exceptional person.

This transcript has been automatically generated and may not be 100% accurate.

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