Who Killed JonBenét Ramsey' director Jon Berlinger on speaking with John Ramsey, researching the case and more for the Netflix docuseries.

One month before the 28th anniversary of JonBenét Ramsey’s murder, Netflix will premiere a three-part “Cold Case” documentary about the Boulder crime, which captivated the world and remains unsolved.

who did a “deep dive” into the murder and investigation that increased his skepticism – resulting in his new Netflix three-part docuseries, Cold Case: Who Killed JonBenét Ramsey, which premieres on Monday. JonBenet, right, poses in a family photo ...