A Bronx vigilante ordered a man on the street to stop beating his girlfriend—then shot him in the face when the attacker refused to comply. "What are you hitting her for?" the vigilante asked David Williams as he punched the 19-year-old mother of his toddler son. "Why don't you stop?" When Williams told the passer-by to mind his own business, the gunman responded: "Mind my business?" and shot Williams, who crumpled to the sidewalk and died a short time later. Williams had 10 arrests for domestic violence, reports the New York Daily News. Police are hunting for the gunman.