Quentin S. Williams Jr., who is also an Amazon employee, turned himself in to police Saturday in connection with the shooting.
Melrose Park officials said the shooting stemmed from a domestic-related dispute between Williams and another Amazon employee who was with Travion R. Taylor, 27, of Chicago in an employee garage at an Amazon Fulfillment Center in the 1800-block of North Fifth Avenue in Melrose Park Thursday morning.
Williams pulled out a gun and fired shots at Taylor and the other person, officials said.
Taylor was shot in the back and taken to Loyola Hospital, where he died.
Williams drove away in a dark sedan after the shooting, prosecutors said.
He appeared in court Monday and was ordered held, pending trial.
The video in the player above is from an earlier report.