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Tears roll down John Walsh`s cheek as he talks about the death of his son, Adam, and the conclusion of his murder investigation during a news conference in Hollywood, Fla. Tuesday, Dec. 16, 2008. A serial killer who died more than a decade ago is the person who decapitated the 6-year-old son of `America`s Most Wanted` host John Walsh in 1981, Florida police said Tuesday.