Whilst this is entertaining if somewhat gruesome it's almost entirely fabricated nonsense. Almost none of what is claimed in this programme is factual it's just made up myth along the years that people have become to believe and peddle as fact. The real story is far less dramatic he murdered people for money whilst that's bad enough all the aspects they put into this show re the pleasure he got from killing have zero basis in any fact. The murder hotel again portrayed as some sinister killing palace with secret chambers and death rooms there is zero real evidence for this as well. The hotel was examined at the time for evidence and non of what's accepted as fact re these killing rooms was documented in contemporaneous records. All the accounts with these "facts" in them did not appear for almost a century after the crimes and as so little was actually documented and the building had burnt down years before authors just let their imagination run riot. Classifying him as a serial killer isn't even accurate yes he killed more than 3 people but the motive was just fraud and monetary gain not pleasure at killing as it's often portrayed and usually a definition of a serial killer needs to be made from killing for sexual or other personal psychological pleasure not monetary gain.
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