The body of a 24-year-old man was found along a road on the Mississippi Band of Choctaw Indians reservation in Neshoba County.
Bennie Stafford was found dead Tuesday. Choctaw Police criminal investigator Robert York says the FBI is assisting in the investigation.
A passing motorist saw Stafford on the side of the road, stopped and got out to help him, then called the police.
An autopsy was ordered to try to determine the cause of death.