A former employee of a Home Depot chased his ex-girlfriend into the store Saturday, killing her and another woman before killing himself after police arrived, authorities said.
A fourth person was wounded by gunfire.
Brandon Bolton, 22, and 20-year-old Lisa Atkins had worked at the Home Depot about 15 miles south of downtown Atlanta.
"We don't know what led up to this," said Clayton County police Maj. Doug Jewett.
Friends of Atkins said Bolton was obsessed with her and angry about their breakup.
No customers were involved, although some may have witnessed the shooting about 8 a.m., just as the store was opening for the day, Jewett said.
Atkins was shot multiple times, including at least once in the head, Jewett said. Tiffany Busch, 27, was shot in the head and died in surgery.
Maurice Jenkins, 31, was shot in the arm and back and was in good condition Saturday afternoon at Southern Regional Medical Center.
After the shots were fired, Bolton ran out of the store and exchanged shots with a police officer, Jewett said. Neither the officer nor Bolton was hit.
Bolton then went back into the store and shot himself after he was cornered in one of the aisles, Jewett said.