Fulton County police Cpl. Kay Lester said he had pulled over in the shoulder of the freeway near the Cascade Road exit around 3:30 p.m. Tuesday. Police say the driver who hit the man stopped. It's unclear whether that motorist will face charges.
The man who was killed was later identified as 54-year-old Dwight Moody of Covington.
The Atlanta Journal-Constitution reports since August, there have been three similar accidents.
A brother and sister were killed Aug. 26 as they changed a tire near on I-75 in Morrow.
Last month, a man was killed on I-20 in DeKalb County when he stopped to help someone with a flat tire.