Macon police say the woman was shot to death Tuesday afternoon at a Murphy Express station on Gray Highway.
Police said in a statement that a man's motorized wheelchair bumped into 65-year-old Linda Hunnicutt's car, who exchanged words with the 73-year-old man in the wheelchair.
Police say Hunnicutt got out of her Buick Lucerne, and the man in the wheelchair drew a gun and shot her in the chest.
Hunnicutt, who is from Jones County, was taken to the Medical Center of Central Georgia where she died.
The suspect, who is from Macon, was taken into custody. Information on possible charges was not immediately available early Wednesday.