E! News has learned that he was staying at the Fairmont Hotel and missed his check out time, according to Vancouver Police. Just after noon today he was found dead and alone.
According to Deputy Chief Doug LaPard, there are no indications of foul play and they are not discussing what was found in the room.
Monteith checked in July 6 and he was not staying with girlfriend/Glee co-star Lea Michele.
Monteith's family has been informed, according to LaPard, and when the actor was found he had been deceased for several hours.
Vancouver PD reports that a video showed Monteith returning to his hotel room by himself in early morning hours. There is no cause of death yet.
Here's what stars are saying about the terribly sad news.
Kaley Cuoco: "#CoryMonteith no words. Prayers. Thoughts w his family. This is terrible. Can't speak."
Holly Marie Combs: "Life is hard. Be nice. For you never know what another could be struggling with or against. You never know. #RipCoryMonteith"
Scott Porter: "This news of Cory Monteith's death just shakes me to my very core. So young. My thoughts and prayers to his family and friends."
Nick Zano: "All of our lives are precious & can be gone in a flash, live better, smarter & show true appreciation for the now. Sad day. #RIPCoryMonteith"
Chloe Moretz: "I just heard about Cory Monteith.. Rest in peace, everyone close to him and affected by this loss you're in my prayers."
Zendaya Coleman: "so sad...rest in peace Cory"
Dot Marie Jones: "I have no words! My hear tis broken Cory was not only a hell of a friend he was one amazing men that I will hold close to my heart forever"
Adam Shankman: "Goodbye my amazing and beautiful friend. The lights in my world just grew dimmer. The world just lost one of our best. I love u so much..."
Marlee Matlin: "Such a tragedy when a young person passes - whether famous or who just happens to be in the wrong place or circumstances."
Kevin Zegers: "I've never lost a friend this close. This feels like a mistake."
Nash Overstreet: "I can't express how sad & horrible it is to hear about Cory Monteith.One of the best, kindest, guys I've ever met.Pray for him, & his family"