American chess grandmaster Daniel Naroditsky passed away at the age of 29, and his cause of death has been confirmed.

He died back in October, where he was found deceased at his home in North Carolina. Now, the medical examiner has revealed what happened.

Keep reading to find out more…

Officials told TMZ that it was an “accidental poisoning after ingesting a drug cocktail.”

His system contained a “combination of methamphetamine and amphetamine” as well as “mitragynine, a substance known for its opioid-like effects.”

He became a chess grandmaster at age 17.

In his final YouTube video on October 17, days before his death, Daniel opened up about his hiatus from making videos.

“I know that the episodes have been few and far between. I’ve been sort of taking a kind of creative break, deciding future avenues of content. I won’t delve too much into it now because I know everybody’s excited for some chess games,” he said.

Our thoughts are with his loved ones. RIP.