Killer Unknown

A special task force cracks open the cold cases of Tulsa County, starting with the 1973 murder of Veda Woodson, and the 1998 murder of 16-year-old Dena Ann Dean.

An effort to find Dena's friend Brandi may yield results, and discussions tell of a tense relationship right before Dena's murder. A secret might have endangered her life.

A family recalls the moments leading to Veda Woodson's murder on an empty road. On the Dean case, officers examining Dena's family make a shocking conclusion.

Detective Mike Huff narrows his focus to a young man who was Dena Dean's boyfriend in 1998, and the last people she had contact with the day of her disappearance.

On the Dean case, phones are examined for communications between persons of interest. On the Woodson case, is the suspect's family hiding something?

On the Dena Dean case, the Task Force races to put the information they have collected towards prosecution; on the Veda Woodson case, a shocking new DNA breakthrough keeps this 45-year-old murder from going cold for good.