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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...

Days before an 'Unsolved Mysteries' episode aired on the disappearance of Joshua Guimond, the Stearns County Sheriff's Office released 28 images discovered on his computer. Lt. Zach Sorenson said the decision to hold on to those photos until days before the episode aired was a 'strategic investigative decision.'

Days before an 'Unsolved Mysteries' episode aired on the disappearance of Joshua Guimond, the Stearns County Sheriff's Office released 28 images discovered on his computer. Lt. Zach Sorenson said the decision to hold on to those photos until days before the episode aired was a 'strategic investigative decision.'

Unsolved Mysteries has a new episode entitled What Happened to Josh featuring the disappearance of Josh Guimond.

Unsolved Mysteries has a new episode entitled What Happened to Josh featuring the disappearance of Josh Guimond.