liam mcatasney has a quote "the question isn't what we are going to do. the question is, what aren't we going to do?" >> sarah wasn't really interested in boys. she was very much doing her own thing, looking to pursue her art, start her career. she was never romantically involved with liam, nor preston. and she was happy to have them as good guy friends. they bonded over things like movies and video games and comic books, the things that she was genuinely into. >> early in sarah's life, when she was a freshman in high school, her mom passed away from cancer. >> she definitely learned to lean on her dad and her friends and use that support system around her when she needed it. so she never had a reason to feel alone. >> sarah and her dad were very close. they became even closer after her mother passed away. >> she started to develop, started to blossom, and she had this passion for art. for the youtube scene. and she just had plans and dreams. >> "a reckless optimist" was her favorite quote. >> a reckless optimist. >> yeah. you know, always looking at the

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 irrev

liam mcatasney now faces life in prison without parole for the >> so much more to this story. thank 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. sym

liam mcatasney now faces life in prison without the possibility of parole. he will be sentenced in may but i have to say, for tonight, we have unparalleled access to the police body cam recordings of the blow-by-blow, minute-by-minute moment of how this case unfolded. it is fascinating. it is chilling. and it's something you won't forget. >> yeah, the reporting here is so deep, amy. and it's a two-hour special. the two-hour special tonight, that's at 9:00 eastern. thank you. >> thank you, amy. >>> next we have the story behind this photo. what happened to grandma? >> hmm. tennessee, a city with one of the highest increases of women-owned businesses in the u.s. it's really this constant juxtaposition when you're a mom and an entrepreneur. with more businesses starting every day, how do they plan for their financial wellness? i am very mindful of the sacrifices that i make. so i have to manage my time wisely. plan your financial life with prudential. bring your challenges. brushing only reaches 25% of your mouth. listerine® cleans virtually 100%. helping to p