The police comissioner is probably dead by now, and he probably got lynched by distracted townspeople.
I wouldn't be so sure that it was a vigilante kill since we didn't hear about a doctor save.
I believe that Nikon was the cop:
I think his night 1 and night 2 investigations were goltar25 and Moar, respectively, and that his night 4 inspection was Sint Nikolaas.
(looks for n3 and n5 investigations...)
His night 5 investigation might have been Thyiad, but he didn't have anything unusual to say day 3, so I don't have a non-random guess for his 3rd investigation.
I was going to make a long and less direct post, then I realized that I didn't have the time to do so.
Synopsis:
Moar and Sint are mafia.
goltar25 and Thyiad are NOT mafia.
I'm a confirmed townie in my eyes.
This post will lynch Sint.
Vote: Sint Nikolaas
(Approaches Sint with the noose)