b'Colorado killer dad Chris Watts tells a chilling story to investigators about why and how he murdered his pregnant wife and two young daughters last August. Nancy Grace listens to the just released audio recording of the prison interview with Watts by the FBI and Colorado Bureau of Investigation. Nancy\'s panel includes\\xa0forensics expert\\xa0Joseph Scott Morgan -- author of "Blood Beneath My Feet,"\\xa0Southern California prosecutor\\xa0Wendy Patrick,\\xa0psychologist & lawyer\\xa0Dr. Brian Russell -- host of Investigation Discovery\'s "Fatal Vows" series, and CrimeOnline reporter\\xa0Ellen Killoran.'