Kristin Smart was a 19-year-old student at California Polytechnic State University when she disappeared on May 25, 1996, after attending a campus party. No one has ever been charged in her disappearance and she is still missing more than 20 years later. Kristin's parents Denise and Stan Smart have never given up in their search for answers. They discuss their daughter's case with Nancy Grace, victims advocate Marc Klass and forensics expert Joseph Scott Morgan in this episode.