Antioch police said an unknown male suspect fled the scene before officers arrived and remains at large, according to a press release police issued at 2:25 a.m. Thursday.
Police responded to a 7 p.m. report of a shooting Wednesday and found the female victim in an upstairs bedroom with at least one gunshot wound, along with evidence indicating she was shot while in the house.
Officers and paramedics provided medical care, but the girl died from her injuries at the scene.
Detectives are interviewing witnesses and working to identify any suspects or persons of interest.
Anyone with information is asked to call the Antioch Police Department non-emergency line at (925)778-2441, or Detective Bledsoe at 925-779-6884, or text-a-tip to 274637