"Glee" star Lea Michele has been mourning the death of her co-star and boyfriend of more than a year, Cory Monteith, with his family, her rep told ABC News.

"Lea is deeply grateful for all the love and support she's received from family, friends, and fans. Since Cory's passing, Lea has been grieving alongside his family and making appropriate arrangements with them," the rep's statement read. "They are supporting each other as they endure this profound loss together. We continue to ask the media to respect the privacy of Lea and Cory's family."

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On Tuesday, the British Columbia Coroners Service announced that Monteith, 31, died Saturday of mixed drug toxicity, including heroin and alcohol.

"It should be noted that at this point there is no evidence to suggest Mr. Monteith's death was anything other than a most-tragic accident," coroner Barb McLintock wrote in a bulletin. "The investigation into this death by the BC Coroners Service is continuing, and no other details are available at this time. … When the investigation is concluded, a coroners report will be issued."

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Michele, 26, who asked for privacy in the immediate aftermath of Monteith's death, had always been an important part of his support system.

This past spring, when the actor went to rehab for substance addiction, she made it clear that she would be there for him when he finished treatment.

"I love and support Cory," she said at the time. "I am grateful and proud he made this decision."

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