Investigators are hoping that the medical examiner will soon be able to determine how 13-year-old Deontae Mitchell was killed.
Police sources believe he was beaten by Gregory Walker, 45, but say there is no obvious cause of death. An autopsy is set for Friday.
Thursday morning, Mitchell's body was found in tall grass near Harper and Baldwin, several hours after Walker and his girlfriend were arrested at a Days Inn Hotel in Toledo, Ohio.
Police say Walker kidnapped Mitchell Tuesday night outside Nino's liquor store on Warren at Buckingham on Detroit's east side.
Walker was reportedly upset because he thought Mitchell or his cousin had taken about $75 that he accidentally dropped.
Witnesses say Walker was drunk and brandishing a gun.
Police say Walker is the man who is seen on surveillance video forcing Mitchell into his vehicle.
Walker and his 43-year-old girlfriend are expected to be extradited.