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New York prosecutors have begun presenting their case to a grand jury against real estate heir Robert Durst for the death of his former wife who went missing decades ago.

Kathie Durst was 29 when she vanished in January 1982 from the couple's South Salem, New York, home. No one was ever charged in the case, and she was declared legally dead in 2017. 

ROBERT DURST PROSECUTOR COMPARES TESTIMONY TO COCKROACH SOUP DURING CLOSING ARGUMENT

In this still image taken from the Law & Crime Network court video, real estate heir Robert Durst answers questions while taking the stand during his murder trial on Aug. 31, in Los Angeles County Superior Court in Inglewood, Calif. 

In this still image taken from the Law & Crime Network court video, real estate heir Robert Durst answers questions while taking the stand during his murder trial on Aug. 31, in Los Angeles County Superior Court in Inglewood, Calif.  (Law & Crime Network via AP)

Durst, 78, was sentenced last week in Los Angeles County to life in prison for the 2000 murder of his longtime friend Susan Berman. Prosecutors said Durst killed Berman because she was going to speak with investigators about how she helped cover up the death of Kathie Durst. 

Authorities reopened the Kathie Durst case in 1999.

Prosecutors share photo of Robert Durst (left), Susan Berman (middle) and Kathie Durst (right) at Robert Durst's Aug. 11 murder trial. 

Prosecutors share photo of Robert Durst (left), Susan Berman (middle) and Kathie Durst (right) at Robert Durst's Aug. 11 murder trial.  (Fox News)

Durst was in a wheelchair for most of his trial and was hospitalized on a ventilator after testing positive for COVID-19, his lawyers said. 

A grand jury in Westchester County, New York, was empaneled last week and has started hearing witness testimony in the Kathie Durst case, a person familiar with the matter told The Associated Press. The Westchester County District Attorney's Office declined to comment to Fox News on the matter. 

Fox News has also reached out to lawyers for Durst. 

The real estate heir has faced numerous legal problems over the years. He was acquitted of killing a man while living in a Texas boarding house but was found guilty of chopping him up and tossing his remains out to sea. 

Robert Durst seen wrapped in blanket during trial on June 14, 2021.

Robert Durst seen wrapped in blanket during trial on June 14, 2021. (POOL)

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Prosecutors alleged Durst was hiding in Texas under an alias to avoid possible criminal charges after investigators reopened the case of his missing wife and that he killed the man after he found out his true identity. 

Before he was sentenced last week, Los Angeles County prosecutors pleaded with Durst to reveal what happened to Berman and his wife to give their families closure. 

The Associated Press contributed to this report.