. >> reporter: the caller was meredith fisher. she had just discovered, on the floor of the master bedroom, the savagely beaten body of her elder sister, 29-year-old michelle young. a woman who, in death, was about to be famous. >> listen to me, ma'am. i'm going to tell you what to do, but you need to calm down so we can help her. you said there's blood everywhere? >> yes. >> listen to me, ma'am. >> i'm listening. >> is she breathing? >> i don't think so. >> have you checked? >> michelle? she's cold. >> okay. >> reporter: as she spoke meredith was cradling her 2-and-a-half year old niece cassidy, who had crawled out from under the bedclothes on her parents bed, just feet from where her mother lay. cassidy's voice, chattering to her aunt, was caught on the recorded call. >> she got boo-boos everywhere. >> reporter: had cassidy witnessed the murder? or awakened, alone, to find this? >> you just picture a small child walking around in this blood and tracking that across the hallway over into the bathroom. >> reporter: by now wake cou