The Mississippi Highway Patrol said Garner's death appeared to be accidental, the Dothan (Ala.) Eagle reported. The body was discovered about 2:30 a.m. Thursday on U.S. Highway 61 near Clarksdale, Miss., where Garner lived.
State Trooper Tony Dunn said an accident reconstruction team was involved in the investigation. He said two cars apparently drove over Garner's body.
Garner, a graduate of Clarksdale High School, transferred to Troy, a public university in Troy, Ala., from Jones County Community College in Mississippi, Troy said on its website. He was a sophomore and played two seasons as a defensive end with the football team.
He played all 12 games in the fall season and was named Sun Belt Conference Defensive Player of the Week on Sept. 9.
"This is a terrible tragedy and our thoughts and prayers go out to Jadarius' family in this time of grief," head Coach Larry Blakeney said. "Jadarius was a well respected member of our football team and his loss will be felt by all of us."