Atlanta Police Chief Erika Shields is stepping down from the role, a move that comes less than 24 hours after an officer shot and killed a man authorities claim was resisting arrest. "A field sobriety test was performed on the male subject. After failing the test, the officers attempted to place the male subject into custody," reads the press release. "During the arrest, the male subject resisted and a struggle ensued. "Witnesses report that during the struggle the male subject grabbed and was in possession of the Taser.