Authorities say the officer was assisting a tactical team at the time of the shooting.
Cmdr. Bauer was taken to Northwestern Memorial Hospital where he was pronounced dead.
According to multiple sources, the officer shot was a high-ranking member of the police department.
"I just ask the entire city for your thoughts and prayers", Johnson said, reported NBC Chicago. Bauer confronted the suspect, who then opened fire. Paul Bauer was fatally shot near a government building in the city's downtown Loop area after struggling with a man who had been fleeing tactical officers. Paul Bauer of the city's 18th District.
Patrol officers had approached a man in the street last afternoon who was described as acting suspiciously.
Moments later, officers discovered Bauer in a stairwell.
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"There's a radio laying (sic) next to him". The I-Team has learned the officer was shot twice in the head.
Commander Bauer's death prompted an outpouring of sympathy from elected officials, including Gov. Bruce Rauner of IL, who has an office near where the shooting occurred, and Mayor Rahm Emanuel of Chicago, who has faced pressure to reduce the city's high homicide rate.
Police radio traffic caught the moments before the shooting, including a warning from one of the pursuing officers: "Don't anybody get hurt".
"Keep the family in your prayers".
There were initial media reports that the man may have been involved in the robbery of a local business, but Johnson did not provide details about what the man was doing that prompted officers to want to speak with him.
The Chicago commander marks a deadly month for law enforcement in America as seven officers have been shot and killed in the line of duty already in February. "They taped it off, so we couldn't get out".