UPDATE (3:55 p.m.): Police say they have found the body of a woman inside the submerged vehicle in Grapevine Lake. It's unknown if the body is missing 66-year-old Joyce Payne.
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A team using sonar equipment at Grapevine Lake identified Payne's vehicle submerged nearly 400 feet from the shoreline.
Because of the murkiness of the water, police haven't been able to confirm yet if Payne is inside the vehicle.
She went missing two weeks ago.
Payne left her home the morning of May 3 in a 2003 silver Chevy Trailblazer with Texas license plate DV1 5449, police said.
She left her purse, phone and medications behind, police said.