The shooting happened in the 1300 block of South Kedvale Avenue, police spokesman Tom Ahern said in a Twitter post.
The off-duty officer shot the man who he claims was trying to steal his car.
A man was shot in the arm and taken to Mt. Sinai hospital in fair condition, according to a CFD spokesperson.
Two other suspects were also taken into custody from the incident, police said.
The shooting come just hours after Chicago police release crime statistics showing that while overall crime is down, carjackings in Chicago have increased over 100%, and the number of murders and shootings have significantly increased compared to last year.
Area Four Detectives are investigating. The Civilian Office of Police Accountability (COPA) is also on scene and investigating.
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