. >> liam mcatasney was a childhood friend of sarah's. he went to high school with her. just blocks away from each other. liam started woodrow wilson school in seventh grade. that is 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. and then you see sarah stern. she was most artistic. her quote, "be yourself. don't ever be what you think ot