From age 13, he used alcohol and marijuana and started being truant from school.
including alternative programs for troubled teens, Monteith dropped out altogether at age 16.
After an intervention by family and friends he entered drug rehabilitation at age 19.
In a 2011 interview with Parade magazine, he discussed his history of substance abuse as a teen, and in March 2013, he again sought treatment for addiction.
Following his success in that show, Monteith's film work included the movie Monte Carlo, and a starring role in Sisters & Brothers.
Monteith had a troubled adolescence involving substance abuse from age 13; he left school at age 16.
Commenting on the fifth episode of the first season, Eric Goldman of IGN wrote, "We got to see a bit of a darker side to Finn [...] it's good to see this, because up until now, Finn's been a bit too strait-laced to totally invest in".
In the second season's eighth episode, "Furt", Tim Stack of Entertainment Weekly noted "It's been a while since we've gotten some Finn focus, and I think I just missed Cory Monteith.
The following year, he made a brief appearance in Urban Legend: a Bloody Mary. Canadian director Gia Milani's film All The Wrong Reasons stars Monteith as "a big box department store manager whose wife is struggling with post-traumatic stress disorder." Milani suggests he was excited to play his own age, in a "heavy role." He filmed his part on weekdays, flying to Los Angeles on weekends to do promotional work for Glee. Series creator Ryan Murphy took notice of the video, but pointed out that he had to be singing, as auditioning actors for Glee with no theatrical experience were required to prove they could sing and dance as well as act. Not only for Glee, but for anything in life." Finn is the star quarterback of his high school football team, and risks alienation from his friends by joining the school's glee club.
Monteith said of his casting process, "I was like a lot of kids, looking for something to be interested in. He is a popular jock at the top of the school's social hierarchy, but when forced to join the glee club, he finds he loves it.
Her reps have asked that "everyone kindly respect Lea's privacy during this devastating time." For now, at least she's not alone. Mark Salling tweeted the most abrupt response with a simple, "no" following the announcement, but deleted the post shortly after. Peace be with you friend.”" data-reactid="21"Jaimie Alexander, who starred with Monteith in the TV series "Kyle XY," wrote, “RIP Cory Monteith. Cory Monteith you'll always be remembered."" data-reactid="23"Katie Cassidy shared, "So sad to lose a dear friend & talented man... My thoughts are with his family & the #Glee family.
Lauren Potter tweeted, "I am totally heartbroken right now. My heart goes out to all his friends & family," he tweeted." data-reactid="19"Josh Sussman, who plays Jacob on the show, praised Monteith's friendly nature. Jaimie Alexander, who starred with Monteith in the TV series "Kyle XY," wrote, “RIP Cory Monteith. Cory Monteith you'll always be remembered."Kevin Zegers tweeted, "I've never lost a friend this close. Had the pleasure of meeting him last year in Philly on our film Mc Canick.”Kylie Jenner shared her memories, tweeting a picture that shows Cory happily sandwiched between her sister Kendall and herself." data-reactid="32"Even Kylie Jenner shared her memories, tweeting a picture that shows Cory happily sandwiched between her sister Kendall and herself.
But I also forgot what a good, natural actor he can be".