JoAnn Zywicki

JoAnn Zywicki

ADVANCE FOR USE SUNDAY, JULY 29 AND THEREAFTER - In this July 17, 2012 photo, JoAnn Zywicki sits by a photo of her daughter Tammy at her home in Ocala, Fla. Two decades after her daughter Tammy was stabbed to death along an Illinois highway while returning to college in Iowa, the case remains unsolved. (AP Photo/John Raoux)

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