Police open 39-year-old cold case in hopes to find missing teen

It's been almost four decades since 17-year-old Yvonne Reglar went missing, but police have not given up trying to solve the case of her disappearance.

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Reglar disappeared on August 8, 1977. She went to work at the Sunoco Gas Station in Fairway Park, Ohio like she normally did; her coworkers then treated her to lunch around noon. An hour later, an employee from the next shift came but could not find her. Her purse, books and half-eaten lunch were left behind.

Reglar had never been heard from since, and the case quickly went cold.

PHOTOS: See Yvonne and Fairway Park police

In 2014, Reglar's family contacted police and offered to give her DNA to the National Center of Missing and Exploited Children. From then, Fairway Park police has opened the case again in hopes of finding her.

Authorities will continue to give interviews, hand out photos, and gather whatever they can find. A composite photo of what Reglar could look like was created as well, in case she is alive.