John Davis, 28, was shot and killed on September 17, 2015, while unloading groceries at his Morgan Park home in Chicago. According to reports, about 8:40 p.m. three teenagers on bicycles approached and opened fire. Davis and his wife dropped to the ground; Davis was struck in the abdomen and died later that night at a hospital. His wife and an 11-year-old grandson who were present were not seriously injured. A 41-year-old man on a nearby porch sustained a gunshot wound to the ear.

Authorities arrested and charged 18-year-old William Cochran with first-degree murder in connection with Davis’s death; he also faces counts of aggravated battery and discharge of a firearm. Investigators identified Cochran as one of the gunmen after witness statements and said two other suspects remain sought. Davis had worked for the Chicago Police Department for 25 years as a supervisor in the equipment and supply section.

Does anyone have information about the two other suspects or witnessed the shooting that evening?