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.
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.
Monteith felt that Finn had to "grow up a lot" during his time on the show.
The actor said, "Finn started off as the stereotypical dumb jock but as the show has gone on, Finn's not dumb anymore, really, he's just a little naïve".
In May 2010, the cast of Glee went on a two-week live tour with stops in Los Angeles, Phoenix, Chicago, and New York City.
The cast performed hits from the show and several skits between songs. On July 20, 2013, Ryan Murphy stated in various media outlets that Monteith was set to have a tribute in the third episode of season five, which also dealt with the death of his character, Finn Hudson.
The final report, released by the British Columbia Coroners Service on October 2, 2013, confirmed these findings.His storylines have seen him struggle with his decision to stay in the club, which is at the bottom of the social ladder, while he maintains his popular reputation and the respect of the other jocks.The character must deal with his attraction to both head cheerleader Quinn Fabray (Dianna Agron) and glee club star singer Rachel Berry (Lea Michele), and his storylines increasingly focus on his relationship with them both.After consultation with Michele, who also plays Monteith's love interest on Glee, showrunners postponed production of Glee's fifth season to August rather than late July.Consequently, the season premiered a week later than planned.But I also forgot what a good, natural actor he can be".Although he was not a singer before being cast as Finn, Monteith sang lead or joint lead on a large number of songs on the show.They even have a regular girlie night that they call the 'First Wives Club.'Michele says: 'It started a year and a half ago.'The girls would get a bottle of red wine and stay a few hours after work to hang out and catch up in my trailer.'Now we do it whenever we want.'Occasionally we'll let one of the boys in and it's so funny to hear them talk about it. Agron says she was once accidentally punched in the nose while attending a party with two of her classmates. It's why my voice is so nasally.'Riley, 25, says she is not a carbon copy of her Glee character.'Mercedes and I share confidence,' the plus-size actress says. 'I love colour, but all the sneakers and neon and jewellery that she wears?She says: 'So people are drinking and the three of us are standing in this terrified triangle.'All of a sudden, this senior gets into an argument with a guy next to us, and as I'm turning to see what's going on, she goes to punch him and I get clocked in the nose instead.'Blood is everywhere. 'I also never had her insecurities about weight - I was skinny in high school - but I love that now I get to show girls how to be comfortable with their bodies.'Riley says that being on Glee has helped her to fulfil all of her own high school dreams.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.