Chicago Police Officer Murder: Suspects in Custody, New Details Emerge.

Four people have been arrested in connection with the shooting death of Chicago Police Officer Areanah Preston, who was shot multiple times outside her family's home after returning from her shift early Saturday morning. Surveillance video shows a dark car pulling up and at least one person jumping out before speeding off. Preston was days away from receiving her master's degree in criminal justice before she was killed. Her death is being considered in-the-line-of-duty and a vigil will be held in her honor.