According to new reports, "numerous amounts of alcohol" and other unidentified substances were found in the hotel room of late "Glee" actor Cory Monteith, who was discovered dead on Saturday.

A source also told E! News that the 31-year-old had been "partying with friends" at a Vancouver nightclub, before returning to his hotel room alone.

"He had recently been drinking alcohol, but not to the extent there was any alcohol poisoning kind of impact," the source said.

Investigators have not confirmed a connection between the substances found in the hotel room and Monteith's cause of death, but they have asserted that there were no signs of foul play. Officials told E! News that an autopsy was completed on Monday and toxicology tests were being expedited due to the "intense public interest" in the case. Results are expected in the next few days.

Monteith, who completed a stint in rehab last month, had always been open about his struggles with drug addiction in the past. In fact, it was his past that led him to taking his final film role. The actor most recently shot the cop drama "McCanick," in which he played a drug addict.

"In my mind, I was envisioning a teeny little drug guy [for the role], but Cory Monteith is this tall, strapping man," director Josh C. Waller told the L.A. Times about his decision to cast the "Glee" star. "But when I met with him, he wanted to do it so badly. He was very vocal about his past, and said he wanted to tap into things from his youth that he hadn't been able to use as an actor yet."

"He didn't say it was a cathartic experience, but you could sense it," he continued.

Waller also said that Monteith was looking towards the future.

"He was like, 'I know I can't be on that show forever, so I'm starting to prep myself for when it's not on anymore,'" Waller said of Monteith's attitude about life after "Glee". "With 'McCanick,' he was starting that trajectory."