Man whose killing sparked mass protests was "exhibiting characteristics of an armed person" before he was shot by police.
The twin daughters and pastor of Bettie Jones are calling for justice after new report finds shooting "not justified."
The group argues that federal oversight of reforms is necessary after history of racial discrimination.
Laroyce Tankson, 31, shot Chad Robertson, 25, on Feb. 8 at around 8:40 p.m. local time, the police statement said. Robertson was transported to a hospital in serious condition and died on Wednesday.
Police body cam footage fails to show the shots that killed Paul O'Neal, an 18-year-old, unarmed car theft suspect who was shot in the back.
A drug investigation-turned-shootout left a suspect dead and three cops injured in Chicago's West Side on Monday.
A Guardian analysis shows that 30 percent of the police contracts it reviewed contain clauses that officer disciplinary records be kept from the public.
Quintonio LeGrier, 19, called 911 three times before he was fatally shot by a Chicago police officer on December 26, new records show.
The mayor called for "the complete and total reform of the system and policing culture."
Quintonio LeGrier and Bettie Jones were shot and killed the day after Christmas.
Quintonio Legrier, a 19-year-old black student, was also killed.
Chicago has been roiled by street protests and political turmoil since the release of the video.
Chicago mayor faces questions over his handling of a police shooting investigation.
The film's title, "Chi-Raq", is a nod to the prevalence of violent crime in Chicago and Iraq.
Chicago officer Jason Van Dyke is seen on dash cam video shooting McDonald, a black teenager.
Jason Van Dyke allegedly shot the teenager 16 times last year.
McDonald's killing and the 13-month delay releasing any video taken by dashboard cameras on squad cars at the scene have led to days of demonstrations.
Protests were mostly small and peaceful in the days following the release of video footage showing the fatal shooting of Laquan McDonald.
Chicago Police Officer Jason Van Dyke faces first-degree murder charges in the shooting death of Laquan McDonald.