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Also, in the curing factory, there is a newspaper with an article about Hector Munday catching a killer that was trying to preserve his kills, called the Imaginary Killer, who made animatronics out of his kills. The evidence of his first kills, as the Shoestring killer, show him stabbing the victims many times before removing their teeth and one of their ears.
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Hector Munday, the FBI agent who would become Du'Met was into mutilating his victims. If the killer was all about using the curing factory to freeze, mummify, and preserve his victims, why did he try to burn Charlie to a crisp? A burned body wouldn't be great to make into one of his gruesome animatronics. One seems to be devoted to preserving his kills, while the other wants to destroy his victims completely.
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There are also a few hints that there are two men with two different modus operandi. To those that do, The Devil in Me makes it fairly obvious that even with control of the Director's Suite, Du'Met could not be everywhere he is during the game. The game is very good at letting players know exactly what time it is in each chapter, so anyone willing to put in the work can make a pretty accurate timeline of where Du'Met must be during each chapter.
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He's downstairs with Mark in his workshop while also in the interview room where Jamie is watching. He's in the limo that brings them there but then wanders around as the groundskeeper. Throughout the whole six hours of The Devil in Me, Du'Met always seems to be wherever the players are.
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