Nearly 20 years after the death of 6-year-old JonBenet Ramsey, the pageant star's brother is speaking out.

Now 29, Burke is set to appear in a three-part series on "Dr. Phil," starting Monday, September 12.

Burke will reveal "shocking, never-before-heard" details about the case, according to the show.

JonBenet's body was found beaten and strangled in the basement of her parents' Colorado home on December 26 -- the day after she disappeared.

At one point, her parents, John and Patsy Ramsey, had been considered suspects in their daughter's death. They weren't formally cleared of any involvement in the death until 2008. 

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A rendering of the columbarium memorial that is estimated to be completed by next summer or fall in the southeast part of Oakland Cemetery, officials said. (Courtesy of Historic Oakland Foundation)

Credit: Historic Oakland Foundation