for now, back to dateline. >>> >> annie kasprzak had had a rough childhood. was passed along, from foster home to foster home, before she was adopted, by her caseworker, veronica. annie's life finally seemed to be turning around. then, in 2012, annie, just 15, was found murdered, her body, floating in the jordan river. >> there was never a second that your mind it didn't go to-- this is not-- this is not what was supposed to happen. >> an eyewitness said she saw daniel very assault a girl the night and he was killed. that witness also said the girl had shown up with lj. who police could never find. but in the course of their investigation of a very, detectives learned something very interesting. >> you had another lj in that crowd? >> yeah. >> daniel barry? >> yeah. >> what was his nickname? >> so, he used two. one was joker and another one was little joe. >> little joe? lj? >> yeah. >> or very deliberately hiding the fact that him and lj were one in the same. either way, very seemed like the man, but the da wanted more evidence before filing charges. derek jo