Firefighter Walter Patmon Jr., 61, responded to a fire Sunday night and reported feeling shortness of breath when he returned to the firehouse, according to the Chicago Tribune.
He was transported to the hospital where he went into cardiac arrest and died.
Dozens of firefighters and police officers paid tribute to Firefighter Patmon and led a communal prayer as his body was transported to the medical examiner's office.
"He put himself out to help you in any way he could," fellow firefighter Dave Beason said. "Whenever you knew you were going to work with him, you knew you were going to have a goody day."
Firefighter Patmon is survived by his wife and three daughters.
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