“Between the years 1966 and 1974, the Zodiac Killer provided more than 20 written communications to police officials, some including ciphers that have not been cracked to this day. On August 1, 1969, three letters written by the killer were received at the Vallejo Times-Herald, the San Francisco Chronicle, and the San Francisco Examiner. The letters were all nearly identical that took credit for the first shootings at Lake Herman Road and Blue Rock Springs. Included with each letter was one-third of a 408-symbol cryptogram which the killer claimed contained his identity. The killer demanded the newspapers print these on each paper’s front page or he would go around all weekend killing lone people in the night. The Chronicle published its third of the cryptogram which the killer claimed contained his identity and the threatened murders did not happen