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The Lake Berryessa attack marked a major shift in the Zodiac Killer’s method, moving from shootings to a close-contact stabbing. The killer wore a distinctive costume, adding a theatrical element to the crime.
The attacker approached the couple wearing a hooded costume, bound them, and stabbed both victims. He later wrote a message on the victim’s car door referencing previous crimes.
Hartnell provided a detailed account of the attacker. The writing on the car linked the crime to Zodiac.