The accident happened on US301 South near Rainbow Lane, but officials are not sure when it occurred. Police do not know what type of vehicle hit the person.
A passing motorist discovered a body in a ditch around 9:30 a.m. Saturday. Officials believe the person may have been hit and killed overnight and left in the ditch.
Officials have not released the victim's name.
Anyone with information is asked to contact Smithfield police at (919) 934-2121.
With information from Mickey Lamm/WTSB Radio