More details are coming out about the deaths of four people in Oakland this week, including that the two female victims were sisters, and that they were in relationships with the two men who died.

Police said in a press conference yesterday that Amy Derosby called 911 after being shot by her boyfriend, Herman Derico. Police said in a press conference yesterday that she gave them details about the case that will aid in their investigation. Derosby also talked to a neighbor, who called to check on her when he heard gunshots.

Also shot to death in the home was Derosby's sister Amanda Bragg, and Bragg's partner Michael Muzerolle. The couple's 3-year-old child was in the house, but was unhurt in the attack. Police corrected the girl's age during the press conference yesterday, as they had originally reported her as being 4-years-old.

When police arrived at the scene, they found Derico's body lying outside the home, with a 9mm handgun lying next to him. He had turned the gun on himself after killing the other 3 people. So far, police say they're not sure about the motive for the violence