Credit: Frazer Harrison/Getty Images Photo: Cory Monteith on the Red Carpet at the 2013 Critics Choice Awards

Prior to his tragic death on July 13, Cory Monteith had been open about his struggle with drugs and alcohol. He once told told Parade that he was using "anything and everything, as much as possible." Now, People has even more details on the Glee star's difficult past.

One of Cory's two final films was an indie film titled McCanic, where he played a drug addict. Cory didn't have to audition for the role, he just spoke with director Josh C. Waller about his troubled past. "He opened up quite a bit," Josh told People of their meeting for the movie that shot last September. "He was like, 'I can do this character. I know this character. I was this character. I have lived elements of this.' He said, I was a troubled youth.'"

And while we are still awaiting results of the toxicology screen from the autopsy, it is still believed that drugs and/or alcohol most likely played a role in ending Cory's life so early. The 31-year-old actor was found dead in his Vancouver hotel room when he failed to check out Saturday morning.

On his Inside the Actor's Studio appearance last year, Cory opened up about his problem with drugs and alcohol, which began when he "was about 12." Cory said he attended 16 different schools, including some that had alternative programs for "kids that are problematic," before he dropped out of school entirely when he was 16. 

At 19, his mother and friends staged an intervention, but Cory told Parade that his stint in rehab then was not successful. For Cory, the turning point came when he was caught stealing "a significant amount of money" from a family member. Cory faced an ultimatum: kick the habit or go to jail. Cory decided to get serious about changing his ways. He later moved Los Angeles and scored the role of Finn Hudson on Glee in 2009, where the native Canadian made a concerted effort to remain sober. 

The past few years had been good for the actor, with him relying on his best friend and girlfriend Lea Michele, who always stood by his side. But eventually, Cory returned to the drugs and alcohol again and went to rehab earlier this year. Back in the Parade interview, Cory said that while he believed he could resist temptation in Hollywood, "I can't completely rule out any of that happening. But, I can't un-live the life I've lived."

Source: People