SANFORD, FL — The neighborhood watch volunteer charged with killing an unarmed black teenager in Florida asked a judge in the case to step down Monday after she revealed a potential conflict of interest.

George Zimmerman’s attorney, Mark O’Mara, filed the request and said Circuit Judge Jessica Recksiedler revealed the potential conflict last week.

Zimmerman was charged last week with second-degree murder in Trayvon Martin’s Feb. 26 death. The lack of an arrest in the shooting inspired weeks of protests nationwide. Zimmerman is pleading not guilty, saying it was self-defense.

Recksiedler’s potential conflict involves her husband, who works with attorney Mark NeJame. Zimmerman’s family first approached NeJame about representing Zimmerman. He declined and referred them to O’Mara.