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. When Glee was being cast, Monteith's agent, Elena Kirschner, submitted a video of him drumming with some pencils and Tupperware containers.In 2011, he filmed a PSA for Straight But Not Narrow, an online PSA organization aimed at changing the minds of young, straight guys and girls in their attitude and viewpoint towards the LGBT community. 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.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.
According to Glee co-creator Ryan Murphy, Monteith's admission to rehab in March resulted from an emergency intervention on the Paramount lot, in which Murphy and other members of the Glee cast and crew urged Monteith to accompany doctors to the rehab facility, which had been arranged by 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".
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 straight-laced to totally invest in".
Cory Allan Michael Monteith (May 11, 1982 – July 13, 2013) was a Canadian actor and musician, best known for his role as Finn Hudson on the Fox television series Glee.
Born in Calgary, Alberta, Canada, and raised in Victoria, British Columbia, Canada, Monteith had a troubled adolescence involving substance abuse from age 12, and he left school at 16.