Police said that someone pulled up next to the woman and fired shots at her just after 11 p.m.
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The woman was stopped at a red light in the 700-block of North Hamlin Avenue when she was struck in the head twice.
The 26-year-old was taken to Stroger Hospital where police said she died. The Cook County Medical Examiner later identified the victim as Qiana Harding of Chicago.
A source told ABC7 that the victim was not known to police.
No one was in custody early Monday morning as Area Four detectives investigated the fatal shooting.
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There was no description of the offender or the vehicle.
Sunday's homicide added to a long list of weekend violence in Chicago.
Twenty-three people were shot, six fatally across the city since Friday evening.
Last weekend, five people were killed.