almost three years ago, nine-year-old rashad macintosh was killed by a chicago police officer. his mother did not think the details of her son's death made sense. and she wanted answers. >> cnn's melissa flores spent year going over it. and the human side of things we don't see on tv. the waiting at the morgue. the bearing of a child. look at this. >> reporter: there are still many answers left unanswered about rashad's death. the only thing that we know for sure is that a teenager is dead and his mother won't sleep well for a long, long time. >> that son of yours is