New documentary traces murderous millionaire Robert Durst's connection to 3 deaths across multiple states

To date, Kathie has never been found.

Durst was put on trial for Black's murder. He testified that he had gotten into a physical struggle with Black over a handgun and shot him in the head in what he claimed was self-defense. He also admitted on the stand to dismembering Black's body.

The jury found him not guilty, and Durst was acquitted.

"I did not kill Susan Berman, but if I had, I would lie about it," Durst said at his next trial. He was convicted of first-degree murder for shooting Berman from point-blank range in her Los Angeles-area home.

He was sentenced to life in prison without the possibility of parole in a Los Angeles County courtroom, following a drawn-out legal saga. Prosecutors alleged he killed her in an effort to silence her, as she was expected to talk to authorities about how she provided a false alibi for Durst after Kathie vanished in 1982.

Fox News Digital's Louis Casiano and Danielle Wallace contributed to this report.