Las Vegas police have arrested a man and his girlfriend in last month’s shooting that killed two homeless people and wounded three others. Cristobal Omar Perez and his girlfriend Kylee Au Yong were taken into custody on Thursday on charges of murder and battery with a deadly weapon. Officers are working to identify a third suspect. Police also identified the dead as Timothy Brenton and Ashley Burrell. Police said a gunman dropped off by a black SUV was picked up by the getaway car after opening fire on a group of homeless people near a freeway overpass on Dec. 1.