Cardereon Preister was 21 when he was shot and killed on September 10, 2013, in Evanston, Illinois. The shooting happened about 11 p.m. in the 1700 block of Lyons Avenue. Preister was found with a gunshot wound to his back and taken to Evanston NorthShore University Hospital, where he was pronounced dead shortly after arrival.

Police arrested 18-year-old Matthew A. Dubose of Evanston and charged him with first-degree murder. Investigators said the killing was connected to a prior summer altercation between Dubose and Preister over a failed exchange involving drugs, money, and a firearm. Preister had dropped out of Evanston Township High School, was working toward his GED, was employed at Bryn Mawr Country Club through a city youth program, and was a father with one child and another expected.

Does anyone have information about Preister’s last known movements that night or about the earlier exchange mentioned by police?