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Oliver Helbig/Getty Images(NEW YORK) On Saturday, May 25, 1996, Kristin Smart, a freshman at Cal Poly State University, walked home from a party at 2 a.m. and was never seen again. She was 19 years old. An arrest would not be made for 25 years. "20/20" takes a fresh look this Friday, June 23 into why the investigation into Smart s disappearance began slowly, with interviews from investigators and family members. But not all unsolved cases involving college students end in arrest – ABC News features five such cases below. 1996: Kristin Smart The investigation into Kristin Smart s disappearance had complications – Smart s body was never found, false sightings were reported, and the last person to see her alive stopped cooperating with authorities. But the investigation into Smart s disappearance, as San Luis Obispo Sheriff Ian Parkinson told ABC News, "began very slowly." Smart s roommate, Crystal Calvin, noted Smart hadn t returned home on May 25, 1996, an

New castle county police departmentUnited statesNew castle countyNew yorkStearns countyJane prichardDian parkinsonDavid grudbergJosh guimondMichael dearingtonClint coleAndrew struffertChristopher jenkinsJane marie prichardPenn staterOliver helbig getty