The shooting happened around 10:40 p.m. in the 9400 block of Irving Park Road in Schiller Park, police said.
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The location where the shooting happened was SWAY BAR, near O'Hare airport.
When officers arrived at the scene, they located the man who had been shot and performed life-saving measures, Schiller Park police said.
The man was pronounced dead at Lutheran General Hospital, police said.
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He was identified as Jonathan Vallejo, 38, of River Grove, Illinois, by the Cook County Medical Examiner's Office.
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Police continue to investigate the shooting.
No further information was immediately available.