A Miami man is facing two counts of first-degree murder after police say he shot and killed his girlfriend's brothers when they came to her apartment to protect her from him. Antwan Carter, 31, allegedly opened fire on Gianni Pierre, 28, and Jaheim Pierre, 23, inside the Miami apartment at around noon on Saturday, according to the Miami Herald . Both brothers died from their wounds. Police say the brothers went to the apartment because they wanted to check on their sister due to a "history of previous domestic violence" involving Carter, who had been dating their sister for roughly four years. A fight broke out after Jaheim argued with his sister and struck Carter, who had stepped in. Carter then left the apartment, went to his car, and returned, according to detectives. When Carter came back, he shouted, "I bet one of you won't open up," police say. He then shot Gianni, who was sitting on a couch.…