. >> liam mcatasney was a childhood friend of sarah's. he went to high school with her. ed just blocks away from each other. liam started woodrow wilson school in seventh grade. that was the school that sarah attended and they were instantly friends. >> i think she saw someone she could trust and someone who genuinely wanted to be there for her and be her friend. >> preston was another friend of sarah's. they weren't as close as sarah and liam were, but they were friends. preston actually took sarah to the junior prom. >> preston and liam became friends freshman year in high school. and you know, they obviously maintained a close friendship even after high school. they wound up moving in together. >> i think that she definitely thought of them as really good friends and someone she could confide in and trust and talk to. >> when you're leafing through the neptune high school yearbook, 2015, the trident, you really get a picture of this friend group and how it emerged. then you see sarah stern. she was most artistic. her quote, "be yourself. don't ever be what you think ot

it's all about her. >> reporter: what would you say to liam mcatasney if he were sitting here?> you're an evil person. you shouldn't exist on this earth. >> a powerful statement right there. and amy joins us now on set. amy, you were telling me sarah stern's body was never found, so they needed this confession. >> that's right, tom. it was a key piece of evidence. in fact, sarah's dad says without that recorded confession they probably never would have known what happened to her. liam mcatasney now faces life in prison without parole for the murder, and taylor faces 10 to 20 years for his role in the crime, tom. >> so much more to this story. thank you, amy. watch amy's full report on "20/20" tonight at 9:00 right here on abc. >>> when we come back, saying good-bye to a tv legend. remembering that sassy grandmother who made us laugh. >>> more on the miracle moment. the teenager trapped after a plane slammed right into her bedroom. stay with us. ane slammed right into her bedroom. stay with us. ay with us. bedroom. stay with us. month after month, the clock is ticking on irrever

liam mcatasney now faces life in prison without parole for the >> so much more to this story.hank you, amy. watch amy's full report on 20/20 right here on abc. >>> when we come back, saying good-bye to a tv legend. remembering the sassy grandmother who made us laugh. >>> ther trapped after a plane slammed right into her bedroom. stay with us. month after month, the clock is ticking on irreversible joint damage. ongoing pain and stiffness are signs of joint erosion. humira can help stop the clock. prescribed for 15 years, humira targets and blocks a source of inflammation that contributes to joint pain and irreversible damage. vo: humira can lower your ability to fight infections. serious and sometimes fatal infections including tuberculosis, and cancers, including lymphoma, have happened, as have blood, liver, and nervous system problems, serious allergic reactions where certain fungal infections are common, and if you've had tb, hepatitis b, are prone to infections, or have flu-like symptoms or sores. don't start humira if you have an infection. onurer irrejoint damage. sympt

kill her. >> reporter: that now infamous tape orchestrated and secretly recorded by police shows liam mcatasneyling 19-year-old sarah stern. that key piece of evidence not possible without the help of mcatasney's high school friend, anthony curry, ultimately bringing the killer to justice. >> guilty. >> guilty. >> guilty. >> you don't believe somebody would do something like that so, you know, it's heartbreaking in a sense, you know, somebody who is your good friend, you don't think they would do something like that. >> reporter: curry, a filmmaker, now speaking with us exclusively for the first time saying mcatasney originally approached him with the idea, but describing it as a plot for a new horror film involving a young woman who was robbed, killed, and thrown off a bridge. he tells you it's a -- an idea -- >> like a plot for a movie. i make movies. i'm a filmmaker. he used to tell me ideas all the time about films i should make and all that stuff. and he, like, told me about this idea he had to, like, kill this girl. >> reporter: he says he became concerned after the details of sarah's dis