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Mistake. he licked the envelope flap and left enough saliva for dna testing. police now had the dna profile of the zodiac killer. the letter also included another clue. >> i knew it was a code. it was a nine towers because there were nine victims. and i wrote down all the different symbols. and i think i had 23. very close to an alphabet. and then i did something called a frequency count. which is, you write down how many times each letter is used. because, for example, e is the most commonly used letter in the alphabet. >> kieran crowley's father-in-law had been a code-breaker in world war ii...

With this letter he made a mistake. he liquid the envelope flap and left enough saliva for dna testing. police now had the dna profile of the zodiac killer. the letter also included another clue. >> i knew it was a code. it was a nine towers because there were nine victims. and i wrote down all the different symbols. and i think i had 23. very close to an alphabet. and then i did something called a frequency count. which is, you write down how many times each letter is used. because for example e is the most commonly used letter in the alphabet. >> karen crawly's father-in-law had been a code ...