The Morrow Police Department released the names of the two people struck and killed Monday morning while changing a tire.
The accident happened on Interstate 75 north and the ramp to Jonesboro Road in Clayton County.
Savannah Guio, 30, of Texas was pronounced dead at the scene.
Steven Mack, 23, also of Texas, was taken to Grady Memorial Hospital in critical condition where he later died.
Police said the victims were brother and sister.
Police said the pair pulled over in the "gore" area of the interstate. It is a triangular area where the on-ramp meets the interstate.
Authorities said several cars, as many as six, hit the pair and all of the drivers involved are cooperating with police.
"Everyone did stop in this situation," said Callaway. "They did provide the information to us. We did all subsequent investigations and all witness statements are being obtained."
Police said they do anticipate announcing charges.
Investigators said motorists need to pull over in a safe location if they have car trouble.
"I would advise anyone when you're changing your tire, if they do have a flat to move far, far to the right side of the shoulder of the interstate," said Morrow police Capt. James Callaway. "If you have any problems and don't feel safe getting out of your car, please call us. Call 911. We'll send an officer to you to assist you."
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