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Dianna Agron and Naya Rivera Remember ‘Glee’ Co-Star Cory Monteith

Dianna Agron and Naya Rivera (WireImage)Cory Monteith (WireImage)

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."

[Related: Touching Tributes to Cory Monteith Appear on the Red Carpet and Beyond]

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."

Agron and Monteith (Instagram)

Naya Rivera, another member of the "Glee" cast, echoed Agron's sadness.

"The entire Glee family and I are deeply saddened by this tragedy," the statement read. "Cory was and always will be a part of my own family and a good friend. He was a special part of this world and will forever be missed. My heart goes out to Cory's family and Lea and while we are grateful for everyone's well wishes, privacy during this time of grief is greatly appreciated."

[Related: What We Know About Cory Monteith's Final Days]

On Tuesday, Canadian officials revealed that Monteith's official cause of death was "an accidental overdose of heroin and alcohol."

Monteith's body was cremated on the same day, omg! has learned.

Fans are already holding memorials for the native Canadian outside both Paramount Studios in L.A., where "Glee" was filmed, and the Fairmont Pacific Rim hotel in Vancouver, where his body was found. Details for an official memorial service have not yet been released.

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