A body was discovered under a pontoon boat Saturday evening on Riverfront Drive, off Sandbar Ferry Road, authorities said.
After 8 p.m., deputies were called to the 700 block of Riverfront Drive after a resident found a body under a boat on the river.
Authorities called in the Department of Natural Resources dive team and the crime scene technicians.
Investigators at the scene said the body had been in the water for at least a few days.
No other details have been released.