For two decades, the murder of JonBenet Ramsey has remained one of the most mysterious cold cases in history. The child beauty queen was killed on Christmas Day 1996; her body was found in the basement of her family’s 15-room mansion in Boulder, CO.

Bizarre circumstances and unexplained evidence led the police to immediately focus their investigation on her parents, John and Patsy. Her older brother, Burke, who has never spoken to the media about his sister’s death, breaks his silence on Monday’s episode of Dr. Phil, and reveals why he says he has waited 20 years to speak about his sister’s death.

“For a long time, media basically made our lives crazy. It’s hard to miss the cameras and news trucks in your front yard, and we’d go to the supermarket sometimes and there’d be a tabloid with my picture [or] JonBenet’s picture plastered on the front or they would follow us around. Seeing that as a little kid is just kind of A chaotic nightmare, so I was pretty skeptical of any sort of media, like, it just made me a very private person,” Burke tells Dr. Phil in the exclusive interview. “As to what I'm doing now, it’s the twentieth anniversary and apparently still a lot of tension around it, and I guess I kind of wanted to make it about remembering her and not just another new story.”

On Monday’s season premiere of Dr. Phil, Burke, who says this is the only time he will speak about his sister’s death, opens up about what happened the night his sister died and how he learned of her death. Check here to see where you can watch.

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