A male suspect approached Maxwell Street Express, located at 11600 S. Halsted St., from the south end of the building just before 2:45 a.m. April 17 before shooting at the victim and fleeing the scene, CPD said.
Police said he was wearing a dark jacket with a fur hood, light jeans and a white Bulls hat and was one of two men who got into an argument before the shooting started.
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The 26-year-old woman was shot in the arm.
She is expected to recover.
Anyone with information is asked to call Area Two detectives at (312) 747-8271.