NEW ORLEANS (AP) -- Robert Durst's mumblings about how he "killed them all" provided the dramatic kick to a documentary about the millionaire's troubled life and connection to three slayings, but it was words he penned that helped lead to his arrest on a murder charge, a law enforcement official said.

Analysis linking a letter Durst wrote to his friend Susan Berman a year before her death with one he said "only the killer could have written" to point police to her body was the key new evidence in the long-dormant investigation into the 2000 killing, the official not authorized to speak publicly told The Associated Press on the condition of anonymity because the investigation was ongoing.

Durst, 71, was charged Monday in Los Angeles with first-degree murder in the shooting of Berman, the daughter of a prominent Las Vegas mobster. He could face the death penalty under special circumstances that allege he ambushed her and murdered a witness to a crime.

He waived extradition in New Orleans, but authorities there charged him late Monday with being a felon in possession of a gun because he had a revolver when he was arrested there Saturday. It was not clear how soon he would be returned to California.

Attorney Dick DeGuerin said outside court that Durst didn't kill Berman, and is "ready to end all the rumor and speculation and have a trial."

Presented with the two letters in the finale of "The Jinx: The Life and Deaths of Robert Durst" that aired Sunday on HBO, the eccentric heir blinked, burped oddly, pulled his ear and briefly put his head in his hands before denying he was the killer.

Then he stepped away from the tense interview and went to the bathroom, still wearing the live microphone that recorded what he said next.

"There it is. You're caught!" Durst whispered before the sound of running water is heard. "What the hell did I do? Killed them all, of course."

That moment didn't just make for a captivating ending to the documentary on the eccentric life of an heir to a New York real estate fortune, it could also provide additional evidence for prosecutors.

The official who spoke on the condition of anonymity said the bathroom recording was not presented to prosecutors before charges were filed because detectives were still trying to determine if the recording was tampered with in any way.

But legal experts said the audio and other parts of the interview could become key evidence.

"Any statement that the defendant makes that they want to use against him, they can use against him," said Andrea Roth, a law professor at the University of California, Berkeley. "Even if it's sketchy, and only in context appears to make him look guilty."

Kerry Lawrence, a defense attorney in Westchester County, New York, said Durst's lawyers will have to try to explain away his comments, perhaps dismissing them as a joke.

"Prosecutors would argue it was a candid moment of self-reflection, and I assume will argue that he knew he was still being recorded, and this was either said in jest or he was being facetious or sarcastic or was being provocative," Lawrence said. "I don't think it's quite the smoking gun."

Durst - still worth millions despite his estrangement from his family, whose New York real estate empire is worth about $4 billion - has maintained his innocence in three killings in as many states.

When Durst approached the filmmakers and agreed to go on camera, against the advice of his lawyers, he had already weathered one murder case, winning an acquittal in a gory Galveston, Texas, dismemberment case by claiming he shot his neighbor in self-defense.

He was still suspected in the killing of Berman, whose father was a Las Vegas mobster associated with Bugsy Siegel and Meyer Lansky, and the disappearance of his wife, Kathleen, who was declared dead long after she vanished in New York in 1982.

Berman, 55, was shot once in the back of the head at her home near Beverly Hills shortly before New York investigators planned to question her about Kathleen Durst's disappearance.

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