Kristin Smart, a 19-year-old student at California Polytechnic State University, disappears after attending a campus party. She is still missing more than 20 years later, but now the man accused of her murder stands trial.

Paul Flores is charged with killing the college student during an attempted rape. His father, Ruben Flores is said to have helped bury the slain student behind his home.   Paul Flores maintains his innocence.

Joining Nancy Grace today:

• Joshua Ritter, Criminal defense attorney,  partner at Werksman Jackson & Quinn LLP,  former Los Angeles County deputy district attorney, joshuaritter.com, Twitter @joshuaritteresq  
• Caryn Stark - NYC Psychologist, CarynStark.com, Twitter: @carynpsych, Facebook: "Caryn Stark" 
• Lisa M. Dadio - Former Police Lieutenant, New Haven Police Department, Senior Lecturer, Director of the "Center for Advanced Policing" at the University of New Haven's Forensic Science Department 
• Joe Scott Morgan - Professor of Forensics: Jacksonville State University, Author, "Blood Beneath My Feet", Host: "Body Bags with Joseph Scott Morgan" 
• Stephanie Pagones - Crime Reporter, Fox News Digital, Twitter: @steph_pagones