19-year-old Marissa Williams is locked up in Tuscaloosa County Jail in Alabama after her aunt found out her niece wanted to kill her!

The aunt posed on facebook as a fictional man named Tre 'Topdog' Ellis as experiment to get a look at her niece's online activity as well as teach her a lesson of the dangers of interacting with strangers online... Things quickly took a crazy turn.

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MUGSHOT: Tuscaloosa County Jail