Authorities said it happened just before midnight on Monday at an apartment complex on Glenwood Drive in southwest Atlanta.
One man pulled out a gun and shot another man several times. A woman, 32-year-old Jaena Worrell, then shot the gunman, investigators said.
Police later identified the suspect as Brian Postell-Magwood, age 32, and the victim as Kesean Parks, age 27.
At last check, police said Parks was in fair condition and is expected to recover.
Postell-Magwood died on the scene.
Worrell is not expected to face any charges as police said she acted in self-defense.
The investigation is still on-going, but charges are not expected at this time.