Story highlights Mayor's office issued proclamation for man after father's request

Man ambushed and killed Officer Sonny Kim in 2015

(CNN) Cincinnati Mayor John Cranley apologized after his office inadvertently issued a proclamation honoring a man who ambushed and killed a Cincinnati police officer.

"I am really sorry that my office, that we mistakenly issued a proclamation on behalf of a man that killed, murdered Sonny Kim," Cranley said Thursday night.

Cranley choked back tears as he spoke at a local police union hall. His face was red as he paused several times during his brief, tear-filled statement.

Kim had responded to a 911 call after Trepierre Hummons, 21, contacted emergency operators twice that day, pretending to be a concerned witness who had seen a man acting erratically with a gun. When Kim arrived on scene, he was shot multiple times by Hummons, according to police. Hummons opened fired at two more officers before he was shot and killed.

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