Chicago Mourns Fallen Officer Areanah Preston and Demands Answers.

Four teenagers have been charged with first-degree murder, armed robbery, arson, burglary, possession of a stolen vehicle, and unlawful use of a weapon in the fatal shooting of Chicago Police Officer Areanah Preston. The suspects were part of a group that accosted Preston after she was off-duty early Saturday. Two women who participated in the attack are cooperating with investigators and may testify to a grand jury. Preston's funeral plans are still being arranged.