A Dallas shooter who visited two homes and killed four people late Wednesday night has been identified as Erbie Bowser, 44, a former teacher and army staff sergeant. Bowser appears to have been trying to kill his ex-wife and a former girlfriend, both of whom are believed to be among the victims. Bowser threw a hand grenade into the living room of one of the houses he attacked before shooting two women. He had a history of domestic violence and attempts to evade arrest. Four victims who remain alive are hospitalized and Bowser is now in police custody.