Zika Urosevic, 38, was shot and killed on September 19, 2015, in Humboldt Park, Chicago. He was standing with a group of people in the 1200 block of North Keeler Avenue at about 6 p.m. when two individuals approached and opened fire. Urosevic, who lived in the 4200 block of West Crystal, was struck in the back of the neck and pronounced dead at the scene; the Cook County medical examiner’s office confirmed the details of his death.

The Chicago Police Department opened an investigation and within two weeks arrested 31-year-old Ladarren M. Ball of the 200 block of North Leamington. Ball was charged with first-degree murder and was ordered held without bond at his October 4, 2015, bond hearing; he was scheduled to return to court for further proceedings.

Who in Humboldt Park that evening might have seen what happened or knows more about the shooting?