This Friday, the 31-year-old star will be in theaters everywhere alongside David Morse in the crime mystery McCanick, but you can get a look at Monteith taking on the role of drug addict Simon Weeks through this sneak peek obtained by E! News.
In the clip, the former Glee star is nearly unrecognizable thanks to his long brunette locks and unfamiliar voice. The scene shows Cory's character inhaling a meal at a diner alongside Morse's character, Eugene "Mack" McCanick, who is trying to become better acquainted with Weeks (who has a criminal record).
According to director Josh C. Waller, playing the edgy character was "cathartic" for Monteith.
"You could sense it," he explained to the Los Angeles Times back in July.
"In my mind, I was envisioning a teeny little drug guy, but Cory Monteith is this tall, strapping man," the filmmaker recalled. "But when I met with him, he wanted to do it so badly...He was very vocal about his past, and said he wanted to tap into things from his youth that he hadn't been able to use as an actor yet."
The fallen star had spoken frankly about his battles with substance abuse numerous times, and he had just finished a stint in rehab months before his death. "I'm lucky on so many counts—I'm lucky to be alive," he said in Parade in June 2013. When he was a teenager, he would take "anything and everything, as much as possible. I had a serious problem."
McCanick hits theaters March 21.