Mom. and she said, angie's been found dead. >> just over the phone? >> and i remember saying, god, no. please no. this can't be real. >> it happened, it turned out, the night before in the tiny second floor walkup where the independent 18-year-old had just started to build her life, stabbed to death, her throat cut. and carol was haunted by a conversation she'd had with angie that very week. >> that's what she said to me, you know, mom, i've done something really stupid. >> did you say to her, what did you do? >> no, i didn't want to pry. >> what could it have been, that something stupid? did ...