Updated

The son of Chicago’s police chief has been sworn-in as a rookie officer, a year after donating a kidney to his dad.

The Chicago Sun-Times says Daniel Johnson got a big hug from his new boss, police Superintendent Eddie Johnson, when he crossed the stage Tuesday. The elder Johnson called it “one of the most special days” of his life.

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Eddie Johnson told the crowd of new officers and their families that he was on stage because of his son’s selflessness in donating a kidney. The elder Johnson had acute inflammation of the kidney and got a transplant in 2017.