A mixture of heroin and alcohol killed Glee star Cory Monteith, according to the British Columbia Coroner Service.

"That's really all the information we have at this point," said coroner Barbara McLintock in a statement. "The coroner's investigation is continuing. Mr. Monteith's family is of course aware of the circumstances of his death, and we do on behalf of them ask for privacy as they go through this grieving process... We express our most heartfelt condolences to them and to all Mr. Monteith's friends, of whom we know we have a lot in British Columbia."

The 31-year-old actor was found dead Saturday in his room at the Farimont Pacific Rim Hotel in downtown Vancouver, where he had been staying a week. Hotel staff reportedly discovered him when he missed his checkout time.

"At this point there is no evidence to suggest Mr. Monteith's death was anything other than a most-tragic accident," McLintock continued. "The coroner service office won't be making any further comments on this issue until their investigation is finally concluded."

Monteith, who played the character Finn Hudson on Fox's hit musical comedy Glee, had been struggling with addiction and substance abuse for most of his life. He began using drugs at 13, and went into rehab for the first time at age 19.

About a month before his death, Monteith finished his second rehabilitation program.

Director Adam Shankman told CNN that he spoke to the actor on Saturday morning, shortly before his death. He described the actor as someone who always knew his lines, congratulated coworkers on their performance, welcomed guest crew, and served as the glue that held the show together.

"He showed up every day, and he was a delight," Shankman said.

The show's writers have yet to determine what will become of the first two episodes of the fifth season, as they were written to reintroduce Monteith's character. Although he was not the main star of the ensemble, his character was an enduring fan favorite.

"The first two episodes of the fifth season had been written before the traditional long summer hiatus, in order to get a jump on the new season; production had been scheduled to start next week," Deadline reported. "The return of Monteith's character, hunky high school football star turned glee club darling Finn Hudson, was much anticipated by fans, Monteith having been absent from the final episodes of last season to check himself into a drug treatment facility late last March."