At least five killings in Northern California were claimed by a letter writer calling himself the Zodiac. The case remains open with the San Francisco Police Department and other Bay Area agencies.
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Two teenagers are shot on Lake Herman Road in Benicia.
Attacks in Vallejo, at Lake Berryessa, and in San Francisco; ciphers are mailed to newspapers.
The 408-character cipher is solved by two schoolteachers.
Codebreakers publicly solve the 340-character cipher; no suspect is named by it.
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