By Leslie Bentz, CNN
(CNN) — Medical examiners will conduct an autopsy Monday to determine what killed “Glee” actor Cory Monteith.
Staffers at the Fairmont Pacific Rim Hotel in Vancouver, Canada, discovered the 31-year-old actor’s body in his hotel room Saturday after he missed his checkout time, police said.
While the cause of death was not immediately apparent, police have ruled out the possibility of foul play.
Monteith had been public about his struggle with addiction, and checked in to a rehab facility in late March.
“It’s all about perseverance. Absolute perseverance. You can always get back up,” he told Glamour magazine in June.
It was his second stint in a treatment facility.
Monteith played Finn in the popular Fox series, and credited Glee’s success with helping him to turn his life around.
“It always blows my mind to think about how it was just a Fox pilot that started so humbly a couple of years ago” the actor told GoldDerby in June 2012.
The Facebook page RIP Cory Monteith had more than 669,000 Likes early Monday morning — an indication of how popular the actor was with fans of the show.
The ‘Glee’ staff released a statement via Twitter early Sunday morning, saying, “We are deeply saddened by this tragic news. Cory was an exceptional talent and an even more exceptional person.”
**Click here for reaction from Monteith’s co-star and girlfriend, Lea Michele
Adam Shankman, who directed an episode of ‘Glee’ for each of the past three seasons, told CNN’s Poppy Harlow that he had talked to Monteith on Saturday morning.
Shankman said Monteith was the glue of “Glee.”
“I had several interactions with him yesterday where he said that he was doing amazing,” Shankman said. “He even said I am feeling fantastic. I’m like everybody else, really devastated and confused by what happened.”