The next Zodiac murders occurred on December 20, 1968 at Lake Herman Road about 30 minutes from Travis Air Force base.  Notice how Zodiac wrote this letter about six months after the murders yet gives stunning details of the crime scene.  Dennis Rader/BTK took polaroid pictures of his crime scenes.  Rader also admitted to an FBI agent that he had purchased a camera overseas and used Air Force base darkrooms to develop his pictures.  Rader also used terms such as north and west.  He also abbeviated his months the same Aug, Oct, Sept, etc.  Rader also admitted he purchased a 22 Colt Woodsman overseas.  Both Zodiac and BTK were horrible spellers, numbered their pages the same, called police and left the phone dangling at the phone booth.  Both men used taxis and victims reported seeing the men “shake” with nerves.