CBS' mini-series revisits the unsolved case of a 1996 murder case in 'The Case of: JonBenet Ramsey'

(CNN/CBS)A screenshot of the first-look trailer for "The Case of: JonBenet Ramsey."

Following a growing trend of interest in true-crime shows such as "People v. OJ Simpson," "Making of a Murderer," and "The Jinx," CBS will release a three-part documentary of the still unsolved case of JonBenet Ramsey, a girl murdered a day after Christmas in 1996.

The cold case of Ramsey

JonBenet Ramsey is a six-year-old beauty queen from Colorado who was found dead in Dec. 26, 1996 in the basement of her home after parents reported her missing and possibly kidnapped.

At the time, investigations turned on Ramsey's own parents as prime suspects. A highly-publicized investigation and media frenzy followed as Ramsey's parents are part of the upper class — the mother being a socialite, and the father as a businessman.

However, the case is still unsolved for lack of conclusive evidence. Ramsey's parents published a memoir in 2000, "The Death of Innocence," to clear their name and counter the public persecution they experienced following the death of their daughter.

The family has been finally cleared after a DNA test in 2008 conclusively absolved them from the crime.

The show revisits the controversial case two decades later

Today, 20 years later, CBS will revisit the case with the help of a retired FBI supervisory special agent, a former criminal behavior analyst, and new forensic technology that wasn't available at the time of Ramsey's murder.

The six-hour series will re-examine gathered evidence, recreate the crime scene, and interview witnesses who weren't heard before, to finally piece the puzzle of the circumstances of the girl's murder — and hopefully pin down the suspect.

In the trailer, FBI special agent James Fitzgerald says, "This little girl's homicide to this date has not been resolved. In my opinion, I think we can change that right now."

"The Case of: JonBenet Ramsey" premieres Sept. 18 and is produced by Tom Forman.