More than 100 march to protest death of 15-year-old authorities say committed suicide after chase

More than 120 people gathered to protest the death of 15-year-old Steve Rosenthal, who police say fatally shot himself on the back stairwell of his West Side home after he was briefly chased by officers who allegedly saw him holding a handgun.

Shouting “No justice, no peace,” or “Let us see Steve,”...