Dawn and Antonio Armstrong, married for 18 years, seem to have it all: thriving businesses, a happy marriage, three successful children, and a beautiful home.

The home, however, became the place where the Armstrongs died, shot in their beds in the middle of the night. Their middle son, AJ, calls 911saying he heard gunshots coming from his parents' room on the floor below him.

Dawn and Antonio Armstrong die after being shot. Hours later, 16-year-old AJ is arrested and charged with the murders. 

Two mistrials have been declared in the case, and now Texas prosecutors say they will try AJ Armstrong a third time.   

Joining Nancy Grace today:

• James Shelnutt - 27 years Atlanta Metro Area Major Case Detective; Former S.W.A.T. officer; Attorney (Gadsden, AL), The Shelnutt Law Firm, P.C.; Twitter: @ShelnuttLawFirm 
• Caryn Stark - NYC Psychologist; Twitter: @carynpsych, Facebook: "Caryn Stark" 
• Lisa M. Dadio - Former Police Lieutenant, New Haven Police Department, Annie Le Lead Detective, Professor of Forensic Science and Criminal Investigations at University New Haven   
• Joe Scott Morgan - Professor of Forensics: Jacksonville State University, Author, "Blood Beneath My Feet,: Host: "Body Bags with Joseph Scott Morgan" 
• Jonathan T Gilliam, Former FBI Special Agent, Former Navy SEAL and Author of the best selling Book, SHEEP NO MORE: The Art of Awareness and Attack Survival; Twitter: @JGilliam_SEAL 
• Dave Mack  CrimeOnline Investigative Reporter