Durst, the subject of a 2015 HBO mini-series, was sentenced on Thursday night.
American real estate tycoon Robert Durst has been found guilty of the murder of Susan Berman, his one-time best friend.
55-year-old Berman was found dead in her Beverly Hills home in 2000, having been shot in the head.
In a Los Angeles court on Thursday evening (14 October), Durst was found guilty of Berman's murder.
It had been alleged that he had killed Berman in order to stop her talking to police about his wife Kathleen McCormack's disappearance in 1982.
Durst, now 78 years of age, was the subject of popular HBO documentary mini-series The Jinx: The Life and Deaths of Robert Durst in 2015.
At the very end of the series, Durst, having professed his innocence throughout and seemingly not realising his microphone was still attached and recording, mutters to himself:
"What the hell did I do? Killed them all, of course."
In court on Thursday, Durst was found guilty of first-degree murder in relation to Berman's shooting. He was also found guilty of the special circumstances of lying in wait and killing a witness.
He will serve a mandatory life sentence without the possibility of parole.
Durst has never been charged in connection with the disappearance of his wife.
