Police say a 51-year-old woman is dead after she was shot in the head in Park Slope Wednesday. 
They say the shooting happened just before 1 p.m. along Fourth Avenue. 
According to officials, Nichelle Thomas was critically injured after being shot in the head and was later pronounced dead at a hospital. 
Citizen App video showed paramedics and emergency responders trying to save her at the scene.
Police say a woman dressed in all dark colors was seen running away from the incident. 
Sources tell News 12 a 38-year-old woman surrendered herself Wednesday night at the 78th Precinct. No charges have been filed.