Missing Missouri baby Lisa Irwin

Associated Press
Investigators leave the home of missing baby Lisa Irwin in Kansas City, Mo., Wednesday, Oct. 19, 2011. (AP Photo/Orlin Wagner)

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The Missouri parents of missing 10-month-old Lisa Irwin are growing more desperate while police combing the neighborhood and asking to search people's homes have no leads in what they describe as a rare but terrifying crime. (ABC)

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