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.

Click here for more on this story from WTTE28.com.

Click here for more on this story from WTOL.com.