Sixteen-year-old Dena Ann Dean disappeared after leaving her job at a grocery store in Tulsa, Oklahoma, on June 6, 1998. Her car was left in the store parking lot and she was missing until June 12, when a decomposed body was found in a field by a pond; the Tulsa Medical Examiner ruled the death a homicide.

Suspicion has focused on Dena’s then-boyfriend Michael Converse and his father Robert Converse. Dena reportedly told her boyfriend she was pregnant days before she vanished, but the autopsy found she was not pregnant. Investigators say that claim factored into their thinking about motive. The boyfriend reportedly failed polygraph tests and both men were interviewed repeatedly, but no arrests were ever made.

Cold case investigators have periodically re-examined evidence and retested material with newer DNA methods. The case remains officially unsolved and Dena’s family continues to seek answers. If anyone knew Dena, saw her the night of June 6, 1998, or has information about the Converse men, please come forward.