Footage from a Wal-Mart security camera could hold the key to the whereabouts of a missing Ohio toddler.

U.S. Marshals believe surveillance video from a Wal-Mart in the town of Marion shows 4-year-old Haylee Donathan in a truck with her mother Candace Watson — who also vanished — and her mother's boyfriend, convicted sex offender Rob Potter, according to WTOL-TV in Toledo.

The footage, from two weeks ago, shows Watson going into the story to return an item while Haylee waits in the vehicle with Potter, FOX affiliate WTTE-TV reported.

Watson can then be seen getting back into the truck.

Haylee was last seen May 28. Authorities don't believe the trio is still in Ohio.

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