Zodiac Killer

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Across
  1. 4. Author who wrote a famous book on the case
  2. 5. The case remains this despite extensive investigations
  3. 10. Phrase the Zodiac used to describe himself in a letter
  4. 13. Why the Zodiac's profile was raised from killer to terrorist
  5. 14. Adjective describing the Zodiac's letters to police and media
  6. 15. Start of the time period of the Zodiac's confirmed attacks in California
  7. 18. Coded messages the Zodiac included in his letters
  8. 19. Region where the Zodiac operated and sent letters
  9. 20. Zodiac made unverified claims of a much higher victim this
Down
  1. 1. Zodiac's nickname for police, taken from the Beatles' Yellow Submarine
  2. 2. Confirmed number of the Zodiac's murder victims
  3. 3. Location of the Zodiac's first confirmed attack in December 1968
  4. 6. Symbol the Zodiac sometimes included with his signature
  5. 7. Zodiac's last confirmed murder victim, a taxi driver
  6. 8. Clue in one Zodiac letter hinting at a possible bomb location
  7. 9. Modern forensic tool that could one day unmask the Zodiac
  8. 11. Car model driven by a key eyewitness to the Stine murder
  9. 12. Zodiac claimed he would collect victims as these in the afterlife
  10. 16. Number of known Zodiac victims who lived to describe him
  11. 17. Zodiac made an eerie one to police on the night of Stine's murder