Overview: For the first time, exclusive and never before heard audio diaries of legendary detective Lou Smit will reveal captivating insight into one of America's most notorious cold cases - the murder of 6-year-old pageant queen JonBenét Ramsey.

Genres: Documentary TV Movie Crime

Overview: Elizabeth Vargas takes a fresh look at the most notorious cold case murder in American history. By tracking down new leads and with new DNA tests, this episode takes a deeper dive in hopes of bringing peace to the Ramsey family. Featuring an exclusive interview with John Ramsey, as well as many never-before-seen photos, the documentary also pursues numerous "intruder theories" of the crime. Vargas and retired FBI agent Robert Clark investigate the possibility that the killer may have ties to a group that believed in extra-terrestrial life and the end of the world.

Genres: Documentary Documentary

Overview: Examines the 20 of the most shocking unsolved crimes in history including the disappearance of Adam Walsh, the murder of Jam-Master Jay, the murders of Jason Allen and Lindsay Cutshall, the Tylenol Poisoning scare, the mysterious death of musician Bobby Fuller, the Zodiac Killer, the assassination of spy Alexander Litvinenko, the murder of Vanessa Johnson, the murder of Amber Hagerman, the Isabella Stewart Gardner Museum Robbery, the disappearance of George Allen Smith, disappearance of heiress Jacqueline Levitz, the disappearance of Madeleine McCann, the 2001 Anthrax attacks, the D.B Cooper skyjacking, the murder of Chandra Levy, the disappearance of Jimmy Hoffa, the murder of the Black Dahlia, the murder of JonBenet Ramsey, and the disappearance of Natalee Holloway.

Genres: Documentary Crime

Overview: OverKill examines the 1996 murder of JonBenet Ramsey. It looks at evidence gathered over the years by Lawrence Schiller author of the bestseller "Perfect Murder, Perfect Town". It looks at police investigation tapes and sworn depositions offered by many of those involved in the case and tries to piece together what happened.

Genres: Documentary