Robert Graysmith, author of "Zodiac" and "Zodiac Unmasked", views cryptographs used by the Zodiac killer, Friday, Feb. 23, 2007, in San
Robert Graysmith, author of "Zodiac" and "Zodiac Unmasked", views cryptographs used by the Zodiac killer, Friday, Feb. 23, 2007, in San Francisco. The Zodiac killer is blamed for at least five murders in 1968 and 1969 in the San Francisco Bay Area. He was never caught, though many, including Graysmith, believe he was Arthur Leigh Allen, a Vallejo man who who died in 1992. The $80 million film, "Zodiac," based on the 1986 true-crime book by Graysmith, was shot in 2005 in the San Francisco Bay area. (AP Photo/Ben Margot) ( Ben Margot )