floor. my god help me please. a teenage mom at the center of a murder mystery. fingers were pointed everywhere at everybody. who had a motive to kill? hello and welcome to dateline. a teenage mom and her close circle of friends find themselves at the center of an emotional situation. they were carefree california girl still in high school, but soon their lives would change in a way that if you could ve predicted. here s keith morrison with mean girls. an interesting species a teenage girls. some are sweet. some are not. we call them mean girls. and some in particular as you are about to see have been very mean indeed. i was 1997 when their story began here in the high desert north of l.a.. lancaster, california. there was sara chapin, than 18, a cheerleader and local beauty queen. you are pretty popular kid in high school? i was fairly popular but i was a cheerleader. which helps? yes. amy priest myre, 16, sporty, and ap student who looked like the girl ne