Police invited Jonathan Kasongo to the 12th District station Thursday to award him for his help catching a suspect in the Feb. 5 shooting near the UIC-Halsted station.
Patrick Waldon, 31, is facing charges for allegedly shooting a 30-year-old man in the back after attempting to rob him on a Blue Line train, according to police.
Police said Waldon shot the victim during a struggle over his backpack.
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Kasongo called police and stayed with the victim to make sure he was alright, officers said Thursday.
"I tried to make him more calm. I was telling him that everything was going to be OK," Kasongo said. "I asked him his name, and I was happy because he couldn't breathe anymore, he was like, 'I can't breathe, I can't breathe.' And a few seconds later, the ambulance was there."
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Police also said investigators were able to catch the suspect because of the description Kasongo gave them.
Waldon has been charged with one count of aggravated battery/discharge of a firearm, one count of armed robbery, one count of armed habitual criminal and one issuance of a warrant.
The victim has recovered from his injuries.