How police set up sting operation to record Sarah Stern's killer confessing to murder

Snapchat messages and a phone call between Anthony Curry and Liam McAtasney show how police were able to catch McAtasney confessing to killing Sarah Stern. SUBSCRIBE to ABC NEWS: https://www.youtube.com/ABCNews/ Watch More on http://abcnews.go.com/ LIKE ABC News on FACEBOOK https://www.facebook.com/abcnews FOLLOW ABC News on TWITTER: https://twitter.com/abc GOOD MORNING AMERICA'S HOMEPAGE: https://www.goodmorningamerica.com/