The former property tycoon was filming HBO documentary The Jinx: Life and Deaths of Robert Durst about his connections to three deaths when he remarked off camera he had “killed them all”.
Prosecutors charged Robert Durst with murdering his friend Susan Berman. He may face the death penalty.
Earlier, his lawyer told Fox News he had not meant what he said.
Robert Durst was arrested in New Orleans on Saturday, a day before the final episode of The Jinx.
He appeared in court on March 16 and agreed to be taken to Los Angeles, where prosecutors announced later that day a first-degree murder charge.
Susan Berman had acted as Robert Durst’s spokeswoman and was about to be questioned by police when she was shot in the back of the head at home in Los Angeles in 2000.
The tycoon had long been suspected in the death of his wife, Kathleen Durst, who went missing from their country home in New York State in 1982.
After Susan Berman’s death, he moved to Texas, where he was acquitted of the murder of his elderly neighbor, Morris Black, despite admitting to cutting up the body in a panic after killing him in self-defense.
Robert Durst was arrested on March 14 by FBI agents acting on an arrest warrant issued by Los Angeles prosecutors.
The following night, HBO viewers heard Robert Durst muttering to himself in a hotel bathroom while still wearing a wireless microphone.
“There it is, you’re caught,” he whispered to himself.
“What the hell did I do? Killed them all, of course.”
The remarks came after the filmmakers asked Robert Durst whether he had written a letter only Susan Berman’s killer could have sent.
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