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* There was an executioner in the 1680s named [https://en.wikipedia.org/wiki/Jack_Ketch Jack Ketch], appointed by King Charles II, who was renowned for botching his kills.
* Mr. Ketch sported a Celtic cross tattoo on right hand throughout Season 12. Upon his return in Season 13, the tattoo is gone. It is not clear if Ketch had the tattoo removed intentionally or if his hand was fully healed as a by-product of the resurrection spell.