Mark your calendars. Investigation Discovery is about to premiere a riveting new series called Killer Unknown on Nov. 24, following the Tulsa County Sheriffs Office Cold Case Task Force. In an exclusive teaser clip provided to In Touch, several of the most talented investigators come out of retirement to put their heads together to solve some of the world’s most notorious cold murder cases, including the 1998 murder of 16-year-old Dena Ann Dean. Watch the clip above to see a sneak peak of the new show, and don’t forget to subscribe to our YouTube Channel.

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