A shocking online video brings together a widespread internet group of animal lovers out for justice. Their target, meanwhile, has more horrors planned.

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A new video pushes panic go to the next level, galvanizing the "internet nerds" to intensify their own painstaking investigation as police join the hunt.

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With the killer's identity - and twisted motives - revealed, the group finds more key clues as the global police manhunt reaches a fever pitch.

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