The manhunt is on for a gunman who shot and killed a Bridgeport woman Thursday after she walked into her apartment and discovered someone was already there.Police say 20-year-old Lynn Larsen was coming home from New York City just after 11:00 p.m. As Larsen and her boyfriend entered her Pearl Harbor Circle apartment, someone open fired on them, police say. Larsen?s boyfriend fled as detectives say she stumbled from the building with a gunshot wound to the stomach. Paramedics found Larsen lying on the ground, conscious and able to speak. Police say before Larsen died she told them she didn?t know the shooter.Investigators are interviewing area residents to find witnesses. Police suspect the shooting may have been a robbery-in-progress turned bad. Bridgeport police are urging anyone with information about the case to call 203-576-7917.