Photo detail

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.

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Mystery lingers 20 years after co-ed's killing

Two decades since her daughter was stabbed to death along an Illinois highway while headed back to college, JoAnn Zywicki has weathered the onslaught of birthdays, holidays and special occasions that often torment families of the murdered.

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