Watch Forensic Files Season 13 Online

In 2004, Mary Ann Clibbery was found brutally murdered in her Illinois business and investigators had to determine if this was a robbery gone wrong or a calculated murder. The evidence at the scene told police what happened and they got a huge break when evidence from the murder on top of a nearby frozen river. The investigation focused on the business co-owner George Hansen when police found that he was embezzling from the company and that evidence in the bag also pointed to him.