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BOULDER, Colo. — In an interview scheduled to air Friday night, a member of the grand jury convened in the JonBenet Ramsey case claims to have seen secret evidence.

The juror, who voted to indict parents John and Patsy Ramsey in the death of the death of their daughter, was interviewed for a “20/20” special.

He claims to have seen secret evidence in the course of the proceedings that he said makes it clear who killed the then-6-year-old girl, People reported.

Boulder County District Attorney Stan Garnett was also interviewed for the special. He will address this week’s news that the state plans to conduct new DNA tests on the underwear and long johns that JonBenet was wearing when she was killed.

ABC News reported that “20/20” last month obtained earlier DNA test results and noted former Boulder County District Attorney Mary Lacy referenced a “match of male DNA on two separate items of clothing,” though “match” was never used in the lab notes.

In fact, the lab said the DNA “should not be considered a single source profile.”

No member of the Ramsey family, including brother Burke Ramsey, was considered suspects, Lacy said. No charges have been filed in the case.

Garnett said he doesn’t expect “that DNA test results alone will definitively solve or prove the case” from the new testing.

Ramsey was found dead in the basement of her family’s home in the 700 block of 15th Street on the day after Christmas 1996.

Patsy Ramsey called 911 to say her daughter was missing and a ransom note was found. John Ramsey found her body. An autopsy declared she died of strangulation.

John and Patsy Ramsey constantly maintained they had nothing to do with the death even after they were the focus of a grand jury that first convened in September 1998.

It was later revealed the grand jury decided to indict John and Patsy Ramsey, but then-Boulder County District Attorney Alex Hunter did not sign the indictment, which was sealed for several years.

Hunter said there was not enough evidence to file charges.

More than 1,500 pieces of evidence have been processed and more than 200 DNA samples were analyzed.

Police have received more than 20,000 letters, tips and emails, and more than 1,000 people have been interviewed.

In October, Burke Ramsey filed a $150 million defamation lawsuit against forensic pathologist Dr. Werner Spitz.

The lawsuit stems from the airing of a two-part CBS series in which Spitz theorized Burke Ramsey killed his sister.

Last month, Spitz filed a motion for summary judgment in the case, arguing he was expressing his “point of view” that is allowed under the First Amendment.