The Petal Police Department found the missing body of Rodney Gann, 22, on Magnolia Road within the city limits of Petal.
Gann's fiance reported him missing to the Hattiesburg Police Department on Friday. She later filed a report with the Petal Police Department the following day.
On Sunday officers found Gann's body in his car on the side of the road.
Det. Sammy Ray of the Petal Police Department says that Gann's body was sent to Jackson and the autopsy results will be available on Wednesday.
The case is still under investigation.