It's been a year since a Houston mom disappeared after dropping off her toddler at a babysitter. Police found the truck Maria Jimenez-Rodriguez was driving, but there are few clues about what happened to the paralegal. Nancy Grace talks to Maria's sister Gloria Jimenez and TexasEquuSearch leader Tim Miller about the case. Forensics expert Karen Smith, forensic psychiatrist Dr. Daniel Bober, and Criminal defense lawyer Jason Oshins, join the discussion.