Ethan Couch -- known as the 'Affluenza' teen in the wake of his DUI crash that killed four people -- walked out of jail Monday after serving nearly two years for violating probation. Now 20, Couch must stay out of trouble for another six years of probation. Nancy Grace discusses his case along with other "killer kids" cases in this episode. Grace is joined by lawyer Troy Slaten, prosecutor Wendy Patrick, forensic psychiatrist Dr. Carole Lieberman, private Investigator Vincent Hill and RadarOnline reporter Alexis Tereszcuk.