Real-estate heir Robert Durst admitted to being high on methamphetamines during interviews he gave as part of the 2015 HBO miniseries The Jinx.

In a March 15, 2015 interview with Los Angeles prosecutors, Durst claimed he was intoxicated while filming the series, the Los Angeles Times reported, citing court documents released Friday.

“I was on meth, I was on meth the whole time … it should have been obvious,” Durst said, according to the Times. “I think the reason I did it had to be because I was swooped, speeding.”

The HBO series examined Durst’s links to the 1982 disappearance of his wife and the death in 2000 of his best friend, who was shot and killed in her home. The series also covered the 2001 death of Durst’s former neighbor, whom he admitted to killing. He claimed self defense and was acquitted in that case.

But while filming the show, Durst muttered an apparent confession into his microphone: “What the hell did I do? Killed them all, of course,” he said.

The comment led to his arrest, and he was subsequently interviewed by Los Angeles prosecutors while in a New Orleans jail.

Since then, Durst has been charged with murder, pleaded not guilty and is now awaiting trial, the Times reported.

[Los Angeles Times]

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Write to Katie Reilly at Katie.Reilly@time.com.