This happened at Frank's Lounge on Green Bay Road.
North Chicago police said they responded to the scene about 12:50 a.m. and found a 27-year-old man with a gunshot wound to the chest. Officers began life-saving measures. He was taken to a local hospital and was listed in critical condition.
Before police arrived, the suspect drove away in a black SUV, police said.
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Several minutes after the shooting, a vehicle matching that description crashed on Green Bay Road in Waukegan, police said.
A 35-year-old man, believed to be the suspect, later showed up at a Wisconsin hospital to be treated for a gunshot wound, police said.
Police did not immediately provide his condition.
Police said one person has been charged with attempted murder, but did not immediately provide the person's name.
It is believed this was a targeted shooting, and the North Chicago Police Department is working with the Lake County State's Attorney's Office regarding possible charges, police said.