The three-part interview will air on "The Dr. Phil Show," but Today's Natalie Morales spoke Friday with McGraw about the interview and what to expect from Burke.
"People are going to be very interested in his demeanor, and they're going to find his demeanor atypical," McGraw said. "He might be talking about some pretty dark aspects of this story and smiling while he's talking about that."
In 1999, JonBenet's parents, John and Patsy Ramsey, were indicted by a grand jury but were never charged.
The Ramseys were officially cleared by new evidence in 2008, two years after Patsy Ramsey died from ovarian cancer; however, many people criticized the district attorney's decision to clear the family.