A shooting on Thursday has left a Bronx mother dead.The shooting happened in the fourth-floor hallway of 2585 Grand Concourse. Police say 25-year-old Angelica Grullon was shot twice, once in the head and once in the stomach. They say a woman knocked on her door and robbed her.Police say they believe Grullon tried to run for help because her son and a friend were in the apartment. Cops say the suspect fled in a white livery cab.