Chopper 7 HD was over the scene of the shooting Wednesday afternoon at 59th and Halsted.
The identity of the person killed has not been released, but ABC7 Eyewitness News is told the victims were both young men in their 20s and apparently cousins.
Police say they believe the shooting was gang-related. It occurred at 2:20 p.m. Wednesday afternoon when police say two rival groups were in the store and there was a dispute.
This is the third fatal shooting in Chicago in the last 24 hours, with two on the South Side and one on the West Side.