Police said one or two black men have robbed two people in May.
Police did not say if more charges would be filed against the man, whom they did not name.
Thomas and William Gorman received awards as their retired police officer dad, Joe, sat proudly nearby.
During the incidents, carjackers wait for residents to get out of their cars then demand their keys.
Most recently, a 24-year-old man was shot in his shoulder in Little Village, police said.
A 24-year-old man was shot in his right shoulder late Tuesday night.
A 27-year-old man was wounded during the attempted robbery, police said.
A 61-year-old woman was shot in a home in the 3600 block of South Honore Street, police said.
He allegedly needed help getting up after he was found hiding under a desk at a social services agency.
The man was shot in the 2100 block of South Wabash before taking himself to Mercy Hospital, police said.
The mayor said stopping street violence "is not just the job of the Police Department."
Graffiti found in the building is associated with the animal rights extremism movement, the FBI said.
Darius Lee was found unresponsive on the sidewalk in the 1000 block of West 14th Street, police said.
From Monday until Tuesday, three people were killed and another 12 were wounded in shootings.
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