Updated Tuesday, 2 p.m.
Authorities have identified the deceased as Shannon Larry Chumbler, 37, of Cumming.
Wright said troopers continue the investigation, but have no new leads in the case.
A stop early this morning to check an abandoned car on Interstate 75 led to the discovery of a body that had been struck by several vehicles, spokesman Gordy Wright said.
The deputy about 1:35 a.m. pulled to the side of I-75 northbound near Glade Road in Acworth and saw the body in a travel lane. Authorities say oncoming traffic had hit the person multiple times, but it also appears he or she was in a travel lane on initial impact.
Investigators believe the first vehicle to strike the person is larger, possibly a big truck. Agencies in the area have been alerted to be on the lookout for a larger vehicle with damage consistent with hitting a pedestrian. At 10:30 a.m., none had been found.
GSP, the sheriff's office and the coroner are working to positively identify the person and notify the next of kin.