Colby Ryan took the stand to testify against his mother, Lori Vallow.

The court also heard a phone call between the son and mother, recorded from behind bars. In the call, you can hear Ryan ask Vallow point blank about the murders, but Vallow repeatedly responds, "You weren't there." 

Nate Eaton with East Idaho News reports that Ryan avoided eye contact with his mother even as she stared at him throughout his testimony. Vallow reported mouthed, "Oh my baby," when Ryan entered the courtroom.

Ryan reveals several new details, such as receiving texts from his "sister" sent after the time police believe Tylee died. 

Joining Nancy Grace Today:

• Tara Malek - Bosie, ID, Attorney and Co-owner of Smith + Malek; Former State and Federal Prosecutor; Twitter: @smith_malek
• Robin Dreeke - Behavior Expert & Former FBI Special Agent / Chief of the FBI Counterintelligence Behavioral Analysis Program; Author: "Sizing People Up: A Veteran FBI Agents Manual for Behavior Prediction;" Twitter: @rdreeke 
• Caryn Stark- Psychologist- Trauma and Crime Expert; Twitter: @carnpsych
•  Dr. Jan Gorniak - Medical Examiner, Clark County Office of the Coroner/Medical Examiner (Las Vegas, NV); Board Certified Forensic Pathologist 
• Emily Ashcraft- Reporter for KSL.com in Utah; Twitter: @emilyjaneen3