Lamar Drakes was killed while working on his car right in front of his home near West 104th Street and South Eggleston Avenue in the Roseland neighborhood.
He leaves behind a 3-year-old son and was just two weeks shy of taking his Cook County sheriff's exam, according to his family.
His family is pleading for someone to come forward.
Community activist Andrew Holmes said police have a person of interest they are looking for.
Anyone with information is asked to call Chicago police.