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This content is presented for educational and documentary purposes. The footage shown is used under fair use for the purpose of analysis, commentary, and public interest. The original material has been significantly transformed through editing, contextual text, and narrative structure.

It’s 6:30 p.m. on June 30th. An armed man is stalking his ex-girlfriend, Tasha Castaneda, who's attending another man's birthday party.In just a few minutes, he plans to go in and do the unthinkable…