India, Aug. 16 -- The disappearance of Kristin Smart, a 19-year-old Cal Poly San Luis Obispo freshman, on May 25, 1996, remains an unsolved mystery. Dateline is revisiting the case in a two-hour episode titled 'Justice for Kristin Smart', airing Friday on NBC. The program will feature Kristin's family, investigators, and prosecutors.

The official synopsis for the episode reads: "Kristin Smart, a freshman at California Polytechnic State University in San Luis Obispo, vanishes during Memorial Day weekend in 1996."

"Kristin's parents open up about their frustration with the school's handling of the investigation - and their over-25-year journey to getting answers."

Kristin Smart was last seen intoxicated and walking back to her Muir Hall ...