Judge orders teen detained in slaying of 7-year-old boy on Near West Side

Cook County prosecutors on Saturday said that copious surveillance video, multiple acquaintances, police officers and two eyewitnesses helped identify a 16-year-old boy as the gunman who fired a semiautomatic rifle toward a Near West Side housing complex, killing 7-year-old Jai’Mani Amir Rivera.

The teen, Raysean Comer, who had two active juvenile arrest warrants, along with two pending cases, was recognized in still photos by three Chicago police officers who had prior interactions with him...