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*[B-ROLL: Grainy black-and-white security footage. A hotel elevator. The doors open. A young woman steps in.]* You've probably seen this footage. Even if you don't know her name. Even if you've never followed a true crime case in your life. This footage — 3 minutes and 57 seconds of a young woman in a hotel elevator — has been watched hundreds of millions of times. It was shared across Reddit, Twitter, TikTok, forums in languages I can't read. It was analyzed frame by frame by amateur detectiv