It's been 20 years have passed, but the murder case of the young beauty queen, JonBenet Ramsey is not yet solved. To honor the death anniversary of the six-year-old beauty queen, two networks announced to release docu-series that will feature the story of the Ramseys and JonBenet's murder case in fall.

"Who killed JonBennet?" This is the common questions of most people, especially those who are following the development or news of the murder case.

This fall, CBS and A&E will premiere JonBenet's docu-series. CBS released a trailer of "The Case of JonBenet Ramsey." In the video, a retired FBI special agent said, "This little girl's homicide to this date has not been resolved. In my opinion, I think we can change that right now."

Aside from docu-series, CBS announced that its famous talk show, "Dr. Phil," interviewed JonBenet's brother Burke Ramsey. The talk show will premiere its three-part season, which starts on Monday, Sept. 12, and continues on Tuesday, Sept. 13 and Monday, Sept 19.

JonBenet's family was accused of murdering her. The young beauty queen was found strangled in the basement of her family's home after one hour Patsy and John Ramsey found a ransom letter.

Burke was only nine when his sister murdered. He was also suspected of killing JonBenet, but he was cleared because of a DNA test, according to Mirror UK.

The docu-series "The Case of JonBenét Ramsey" is set to air on Sept. 18. The trailer released in August starts with the real audio conversation of the late Patsy Ramsey and the 911 operator. Meanwhile, A&E's docu-series "The Killing of JonBenét: The Truth Uncovered" is set to air on Labor Day, Sept. 5, at 9 p.m. ET/PT.

A&E's docu-series will feature the unreleased videos related to the investigation, including the 1998 interview with Burke, and JonBenet's father, John's diaries.