Police said Charlene Barber, 44, was arguing with her brother, Kirby Devereaux, most of the day on Sunday at a home on Illinois Avenue. Officials said an uncle heard a door slam so he went to the front of the house to investigate and found Devereaux lying on the sofa with a stab wound to his chest.
Devereaux, 36, was transported to Grady Memorial Hospital where he later died.
Barber was arrested later Sunday and charged with murder. She is being held in the Fulton County Jail.