According to his daughter, Guy Warn Hendrickson, a carpenter with a hot temper, was the Zodiac killer, a serial killer who terrorized California in the late 1960s. Deborah Perez claimed at a press conference on April 29, 2009 that her father, Hendrickson, was the Zodiac killer and that she acted as an accomplice during her youth.

According to Perez and her attorney Kevin McLean, Hendrickson murdered between 30 and 40 victims, some of which weren't random killings. Hendrickson allegedly involved Perez in the "game," creating a father-daughter activity out of his murders.

Though the Zodiac killer is only confirmed to have had five victims between December 1968 and October 1969, letters from the killer claim that the number could be as high as 37. The killer was known for his series of letters written to authorities and his outfit worn when committing the murders, which consisted of a black shroud mask. Multiple suspects have been named and claimed since the murders.