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.
4:04 | 03/01/19

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Transcript for How police set up sting operation to record Sarah Stern's killer confessing to murder
Yeah. Very Hayes age aspiring film director and he went to high school with BM and Saro. Tell me when you first became friends with him. Inning gave real close telling Jamie air place. All. January 2007 team yet started receiving step chat messages from William Mack attacked me how often ones. Trying to contact you necessarily mixing apples and what was he texting what was he saying to him that he wanted to seen. It is there injures and at this moment. A light bulb went off and Marines had. Why did you go athletes going the right thing. Anthony told us that he had wanted to talk to us. About the information that he had Anthony told us that on Thanksgiving. Evening which was November 24 they had went to williams' house in accuracy. And while there Lian had informed him that. What he planned to do to prisoners learn. And tells you it's. An idea or other low end. I make movies a filmmaker we he needs to tell me all ideas all the town and you know don't just make stuff. I think. Tony. S&P. Henson. Kill this girl. These hellish anglin throw them French. When his friend did he seem excited about this idea games I. It was energetic Kinney Jose Angel months. Just thought it was a movement. So Anthony. Doesn't really give it another time until it comes out on social media are there news national missing so please hatch a plan to catch the amount has me. And they cast Anthony curry in the starring role. My camera broke. Dropped it on the issues vision talent to a bucket of blood collects. Last night euros money here. For me thirteen to. I'm out you back ask girls out working out. Yes like anything less feminine. Yeah. And. Friend Eddy Curry discern risky move. Jeanne he's making up a story. About why he needs to meet quickly. Everyone's got to be nervous about this meeting. Detectives he quick pace car. Win theme video recording device and this is going to be their sting operation. And it took me a half an hour killer the fact that I was going to be a list Joker out than ever out like. Couple mentions. You don't believe somebody would do so Arlington so. This. You know it's heartbreaking and ascension assuming he's your good friend. Don't think intentionally. This person it's.

This transcript has been automatically generated and may not be 100% accurate.

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