mass shootings. >> i don't know why i went through columbine, but i think i'm here to help. >> you look so pretty. >> reporter: this year helping brie prepare for prom and graduation, amy says she's filled with hope. >> so many people watched what happened at columbine and all these years later probably wonder how you all are. >> it still hurts. it's never going to fully heal, but there's hope, and i get to watch my kids grow. it's time for the next chapter. >> you look really beautiful. >> reporter: kate snow, nbc news, parker, colorado. and that's "nightly news." a program note, you can catch a new episode of "nightly news: kids edition" saturday on nbc. thank you for watching, everyone. i'm lester holt, please take care of each other. good night.