. >> mystery on the catawba river. captions paid for by nbc-universal television >>> good evening, and welcome to "dateline." i'm ann curry. this week, the conclusion to a case that has fascinated this country three years. the casey anthony story not only streamed live in living rooms but on the internet, sparking a facebook page and even an iphone app. out of the courtroom, the debate is still furious over what really happened to 2-year-old caylee. has justice been served? here's dennis murphy. >> we don't know. >> verdict, not guilty. >> sometimes a trial, a criminal case, grabs a nation's attention and won't let go. this has been one of them. >> the most well-documented liar ever seen in a courtroom, accuses everybody of lying. >> fantasy forensics, phantom stickers, phantom stains, and no real hard evidence. >> a shocker of a verdict that rocked the nation's richter scale. was it justice for the victim, the 2-year-old girl named caylee? the accused, her mother, 25-year-old casey anthony. >> i can't. and i wish i co