
Former Chicago Police officer Jason Van Dyke is set to return from prison Thursday as protesters rally downtown to call for federal charges that could send him back behind bars.
Experts say that any federal charges in the death of 17-year-old Laquan McDonald are unlikely at this point, but for months after the 2014 shooting, federal investigators were leading the probe of Van Dyke. If charges are a long shot now, what happened to the investigation more than seven years ago?