Lindsay Kimble
November 03, 2016 11:23 AM

A former House of Cards extra is speaking out about what she calls her crucial role in the dropped charges against Chandra Levy’s convicted murderer.

“I think it was absolutely my tapes that blew it out of the water,” actress Babs Proller says in an exclusive clip from her upcoming interview on 20/20, which airs Friday.

Proller is referring to recorded conversations between her and Armando Morales, who said he once shared a prison cell with Ingmar Guandique. Morales was a star witness at Guandique’s 2010 murder trial — the center of a largely circumstantial case — where he testified that Guandique had confessed to him.

But the murder conviction was later overturned, and Guandique was awaiting retrial when the case against him was dropped completely earlier this year.

At the time, the U.S. Attorney’s Office for the District of Columbia said in a statement to PEOPLE that prosecutors “can no longer prove the murder case against Mr. Guandique beyond a reasonable doubt.”

According to investigators, new audio had surfaced that drastically undercut Morales’ testimony, Levy’s mother, Susan, previously told PEOPLE.

“It has unraveled the whole case,” Susan said of the audio. “I am overwhelmed. I only wish we could get the person who killed her. Someone knows something, and they need to come forward.”

Guandique (left) and Levy -- AP(2)

Those recordings, Proller tells 20/20, were from her. She previously claimed to have caught Morales revealing he falsely implicated Guandique.

(The Washington Post has also obtained and reviewed several hours of Proller’s tapes and reported they do not capture Morales admitting that his 2010 testimony was a lie — though he is heard making a number of other claims that would have been damaging to his credibility as a witness. Morales could not immediately be reached for comment.)

“After the head-spinning turn in a case most of us thought was closed and in the history books, we were anxious to meet the woman who turned the Chandra Levy story on its head,” ABC News Correspondent Deborah Roberts tells PEOPLE in an exclusive statement.

“Babs Proller … described how she secretly taped conversations with the hardened and possibly dangerous gang member who testified for the prosecution.”

Roberts says, “Babs would only meet us in an undisclosed place and said she was going into hiding after we wrapped our shoot.”

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Roberts says she also met with Guandique, who had been serving 60 years for Levy’s murder, and Chad Condit, the son of Gary Condit — the married former politician identified as a possible suspect and then cleared of involvement in Levy’s death.

Says Roberts, “This notorious story, which riveted us 15 years ago, is again an unsolved mystery.”

“Chandra Levy: Mystery in the Park” airs on 20/20 Friday (10 p.m. ET) on ABC.

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