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A Louisiana man claims in a new book that his biological father was the notorious Zodiac Killer of northern California, who's still sought by authorities, publisher HarperCollins said Tuesday.The Zodiac serial killer is believed to have killed five people in 1968-69 and gained notoriety by writing several letters to police boasting of the slayings, with swatches of bloody clothing as proof of his claims. The serial killer claimed to have killed as many as 37 people and has never been caught.