Monteith, 31, was found dead in his Vancouver, British Columbia, hotel room on Saturday, according to police, who said an autopsy is expected Monday to determine the cause of death.

While it's not known what caused his death, Monteith's passing recalls the lives of Heath Ledger, Corey Haim and River Phoenix — actors who battled substance abuse and died in their 20s and 30s. Monteith talked bluntly about struggling with addiction since he was a teenager, telling Parade magazine in 2011 he was "lucky to be alive."

Monteith admitted himself to a treatment facility in April for substance addiction, a representative said at the time. He had also received treatment when he was 19.

"We all woke up to hear the story, and no one really wanted to believe it was true," said Chloe-Louise Bond, a 22-year-old fan from Wakefield, England. "Walking into the main room, you could just feel the tragedy in the air, absolute strangers became a family right in that moment. Everyone was crying and hugging and just trying to get over the shock."

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