Zodiac gave proof in his communications for four attacks. These attacks spanned December 1968 to October 1969. The targets of the first three were male-female couples in rural areas. The last was a male taxi cab driver in San Francisco. In the taxi driver attack, police converged quickly and almost caught the killer. While other serial killers have also bragged in anonymous communications about their attacks, law enforcement decided that Zodiac's need for publicity was exceptional. There w...