A man suspected of the cold case murder of his wife and son hatches a new plot to kill his mother and father, in this clip from Season 3, Episode 20. Stay up to date on all of A&E's premieres at aetv.com/schedule #ColdCaseFiles Subscribe for more from Cold Case Files and other great A&E shows: http://aetv.us/subscribe-ae Find out more about the show and watch full episodes on our site: http://www.aetv.com/shows/cold-case-files-2017 Check out exclusive A&E content: Website - http://www.aetv.com/ Facebook: https://www.facebook.com/AETV/ Twitter: https://twitter.com/aetv Instagram: https://www.instagram.com/aetv TikTok: https://www.tiktok.com/@aetv "Cold Case Files" chronicles the journeys of the detectives who reopen cold cases. The detectives uncover new twists and startling revelations using breakthroughs in forensic technology and the influence of social media to help crack the cases—bringing long-awaited closure to the victim's families and friends. A&E leads the cultural conversation through high-quality, thought provoking original programming with a unique point of view. Whether it’s the network’s distinctive brand of award-winning disruptive reality, groundbreaking documentary, or premium scripted drama, A&E’s brave storytelling always makes entertainment an art. Visit us at aetv.com for more info.