Fortson B. Knox was a wealthy man and prominent citizen in Dick Tracy's city. He had wavy hair and typically wore eyeglasses. Knox was secretly a member of the criminal syndicate operated by The King. Knox had an attractive young wife named Carol, who resented him. Shortly after the birth of his first child, Knox was robbed by Crewy Lou Brown and her associate Sphinx. He was then murdered by his wife, who attempted to shift the blame for the murder to the robbers.