Multiple Arrests Made in Off-Duty Killing of Female Chicago Cop.

At least four suspects have been arrested in connection with the off-duty killing of Chicago Police Officer Aréanah Preston, who was shot and killed early Saturday while driving home from work. The robbers approached her and opened fire, setting off a gunfight. The robbers grabbed her gun and fled as she lay dying. Investigators were able to track down one suspect during a stop and also arrested four others after an armed standoff. Preston's attackers are suspected of robbing other people around the same time.