Secret witness testifies Robert Durst's wife feared 'The Jinx' subject

The so-called secret witness in the Robert Durst case was revealed Wednesday to be an advertising executive who was introduced to him through a mutual friend — the woman Durst is accused of murdering.

Nick Chavin, 72, took the witness stand at a pretrial hearing and testified that he had met "Bobby" more than three decades ago through his pal, writer Susan Berman, and became such good friends that Durst was the co-best man at his wedding.

Durst, 73, a scion of a massive real estate empire, is charged with murdering Berman in Los Angeles in 2000. Prosecutors claim that he was worried that she would implicate him in the death of his first wife, Kathie, who vanished in 1982. Durst denies killing either woman.

Chavin — who told the New York Times in 2001 that "Bobby didn't kill Kathie" — testified Wednesday that Kathie told him that she was physically afraid of her husband.

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LOS ANGELES, CA - DECEMBER 21: Real Estate Heir Robert Durst appears in the Airport Branch of the Los Angeles County Superior Court during a preliminary hearing on December 21, 2016 in Los Angeles, California. Durst is charged with capital murder in a friend's killing Susan Berman in 2000. (Photo by Jae C. Hong-Pool\Getty Images)
Lawyers (L-R) David Chesnoff and Dick DeGuerin argue their client, New York real estate scion Robert Durst, while he appears in the Los Angeles Superior Court Airport Branch for a pre-trial motions hearing involving witnesses that are expected to testify before the trial in Los Angeles, California on January 6, 2017. The 73-year-old Durst, whose bizarre life was the focus of an acclaimed HBO series, is charged with the 2000 execution-style killing of longtime friend Susan Berman. / AFP / POOL / Mark Boster (Photo credit should read MARK BOSTER/AFP/Getty Images)
NEW ORLEANS, LA - MARCH 14: (EDITOR'S NOTE: Best quality available) In this handout provided by the Orleans Parish Sheriffs Office, OPSO, Robert Durst poses for a mugshot photo after being arrested and detained March 14, 2015 in New Orleans, Louisiana. Family member of a prominent New York City real estate empire and subject of a HBO series, Durst has been arrested on a first-degree murder warrant issued by police in Los Angeles related to the death of his friend, Susan Berman. (Photo by Orleans Parish Sheriffs Office via Getty Images)
UNITED STATES - FEBRUARY 20: Robert Durst of the Durst Organization, Inc. (Photo by Bill Turnbull/NY Daily News Archive via Getty Images)
LOS ANGELES, CA - JANUARY 6: Judge Mark E. Windham speaks from the bench about during a pre-trial motions hearing for New York real estate scion Robert Durst in the Los Angeles Superior Court Airport Branch involving witnesses that are expected to testify before the trial January 6, 2017. (Photo by Mark Boster/Los Angeles Times via Getty Images)
New York real estate scion Robert Durst has a lighter moment with his attorney Dick DeGuerin while appearing in the Los Angeles Superior Court Airport Branch for a pre-trial motions hearing involving witnesses that are expected to testify before the trial in Los Angeles, California on January 6, 2017. The 73-year-old Durst, whose bizarre life was the focus of an acclaimed HBO series, is charged with the 2000 execution-style killing of longtime friend Susan Berman. / AFP / POOL / Mark Boster (Photo credit should read MARK BOSTER/AFP/Getty Images)
Photographers gather at an entrance to the courthouse where Robert Durst appeared for a bail hearing in New Orleans, Louisiana March 23, 2015. Durst, the real estate scion awaiting extradition to California to face a murder charge, was denied bail after a judge deemed him to be a potential danger to others and a likely flight risk. REUTERS/Lee Celano
LOS ANGELES, CA - NOVEMBER 07: Real Estate Heir Robert Durst appears in the Airport Branch of the Los Angeles County Superior Court on November 7, 2016 in Los Angeles, California. Durst has pleaded not guilty to murder in the death of a friend Susan Berman in 2000. (Photo by Pool/Getty Images)
Robert Durst sits in a police vehicle as he leaves a courthouse in New Orleans, Louisiana March 17, 2015. Durst, scion of one of New York's largest real estate empires, was charged on gun and drug charges, after he was arrested in New Orleans on a murder warrant issued by Los Angeles County Saturday. REUTERS/Lee Celano (UNITED STATES - Tags: CRIME LAW)
New York real estate scion Robert Durst appears in the Los Angeles Superior Court Airport Branch for a pre-trial motions hearing involving witnesses that are expected to testify before the trial in Los Angeles, California on January 6, 2017. The 73-year-old Durst, whose bizarre life was the focus of an acclaimed HBO series, is charged with the 2000 execution-style killing of longtime friend Susan Berman. / AFP / POOL / Mark Boster (Photo credit should read MARK BOSTER/AFP/Getty Images)
BEVERLY HILLS, CA MARCH 16, 2015: Robert Durst, wealthy NY real estate heir, has been arrested in connection with the murder of his friend Susan Berman. The crime allegedly was commited by Durst inside this home in Beverly Hills in 2000. A camerman films the exterior of the home. (Francine Orr/ LA Times via Getty Images)
The director of HBO’s docu-series “The Jinx: The Life and Deaths of Robert Durst” discusses the shocking final moments of the show’s finale.
During the final episode of HBO's 'The Jinx,' Robert Durst was accidentally recorded saying he 'killed them all, of course.'
Robert Durst, a member of one of New York's wealthiest families and the subject of an HBO documentary, could face charges over a 15-year-old murder.
Daily News front page December 1, 2001, Headline: NABBED - Millionaire murder suspect Robert Durst caught stealing sandwich (Photo By: /NY Daily News via Getty Images)
Daily News page 8 and 9, November 11, 2000, Headline: Trial heats up in missing wife mystery - Cops shake the dust off '82 Durst case. By a stone cottage in northern Westchester, the pieces of an 18-year-old mystery, the celebrated disappearance of Kathleen Durst are slowing being put together. After more than a decade of inactivity, state police investigators have reopened the Durst case, chasing leads that again focus suspicion on her wealthy husband, real estate heir Robert Durst, law enforcement sources told the Daily News.(Photo By: /NY Daily News via Getty Images)
Daily News front page February 9, 1982, Headline: WIFE MISSING; 100G REWARD - Real estate tycoon's son asks for search - Medical student Kathleen Durst, wife of real estate tycoon Robert Durst and daughter-in-law of Seymour Durst, has been missing since Jan. 31, and the family has offered a $100,000 reward for information. She was last seen at her Riverside Drive apartment house. (Photo By: /NY Daily News via Getty Images)
UNITED STATES - CIRCA 2000: Robert Durst of the Durst Organization, Inc., 133 6th Ave., New York City. (Photo by Bill Turnbull/NY Daily News Archive via Getty Images)
Robert Durst waived extradition Monday morning during a court appearance in New Orleans. He is expected to be sent to Los Angeles to face murder charges.
Robert Durst in a wheelchair arrives for his his arraignment on capital murder charges in the death of Susan Berman, with one of his lawyer David Z. Chesnoff (L) looking on, in Los Angeles, California, U.S. November 7, 2016. REUTERS/Kevork Djansezian
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Durst, meanwhile, described Kathie as "impossible," Chavin testified.

"It was always a strange relationship," he said, adding that Durst said he had an open marriage and would go to bars with Chavin hoping to meet women.

More from NBC News: Durst Hearing Focuses on Mystery of 1982 Phone Call

Chavin also testified about Durst's close relationship with Berman, saying there was nothing she would not have done for him.

Los Angeles County Deputy District Attorney John Lewin asked Chavin whether he ever discussed with Berman whether Durst might have been involved in his wife's disappearance, but the defense objected to the question.

Chavin, who arrived in court with two armed security guards, is back on the stand Thursday for what's expected to be the final day of the hearing. Prosecutors requested the hearing to get early testimony from several witnesses who they said were in danger of falling ill or dying or were scared that Durst could harm them — even though he is serving a seven-year sentence on a gun possession charge.

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Chavin's identity was not revealed until he took the stand.

Earlier, the judge heard from a woman who worked for Chavin, met Durst through him in 2002 and became what she called his "closest friend."

Susan Giordano testified that she visited Durst in Texas while he was jailed for the 2001 death and dismemberment of his elderly neighbor, Morris Black.

She also said that, over time, Durst gave her $350,000 in gifts and loans — of which she repaid $2,000 — and that at one point she discussed with Durst and his lawyers the possibility of getting money from him for the rest of her life.

She said that although she and Durst had a platonic relationship, they talked about having a "love nest," and she said she wanted to spend the rest of her life with him.

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Giordano was called to the stand because she had stored boxes full of Durst's personal papers — and allowed producers of the HBO program "The Jinx" to go through them before they were seized by police in 2015.

The defense claims that the contents of the boxes were privileged and should not be used as evidence at Durst's trial, but prosecutors contend that Durst waived that privilege when he gave "The Jinx" producers access.

"The Jinx" examined Durst's ties to his wife's disappearance and Berman's death, as well as the 2001 death and dismemberment of Black. The series ended with Durst blurting out on a hot microphone that he "killed them all."

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