They're asking for help identifying three suspects seen at a Citgo gas station at 83rd Street and Stony Island Avenue on May 28.
Jeffrey King, 26, was killed during a physical altercation with the men about 11:40 a.m. at the gas station that day, CPD said.
Anyone with information on the incident is asked to call an Area 2 homicide detective at 312-747-8271, according to Chicago police. Tipsters can also submit anonymous information at www.cpdtip.com.
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The three individuals, who appear to be male suspects, can be clearly seen inside the gas station in the video.