A clue perhaps? In flavour it says that Prof has a letter "m" around his neck and Hutt was killed with a letter M carved into his back, coincidence? If joined together could it be the reference to the masons, and on top of that if a mason has a killing ability would it be possible for him/her to be anti town with such an ability, ie SK, although as I understand it, SK is a separate third party so unlikely to be part of a mason group. Prof didn't have the killing abilitiy, he had a double vote so it's unlikely that he is responsible for Hutt's death, so that leaves possibility of a vigilante.
Theory that I proposed earlier in regards to the "crushed" death seems the most plausible to me right now, unless someone offes a better theory, either that or we're stuck with god knows how many serial killers.
Rambling here.