(Yahoo!) - Cory Monteith's sudden death at 31 left his "Glee" co-stars in shock.

Dianna Agron, who played Monteith's former flame on the Fox show, issued a heartfelt statement on Wednesday, four days after he was found unresponsive in a Vancouver hotel room.

"I have never lost a friend," Agron wrote under a photo of herself and Monteith on Instagram. "In this difficult time, I am leaning on all of the wonderful memories we shared with Cory, how many ways he was able to make us smile. Glee was a gift to all of us. It gave us a family in this industry. We really cut our teeth and grew up on this show. In playing underdogs, we learned that we had dug into the hearts of our viewers and that we could stay there."

Agron continued, "Cory is so deserving of that place in everyone's hearts. He was one of the most generous and kind people that I have ever met. He had a smart, curious mind, he was an enormous talent. He was loving to not only me, but my family. My heart goes out to his family, to [girlfriend] Lea [Michele], to everyone that is struggling with the loss of our friend. We will miss you Cory. We will always carry a piece of you with us."


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