I am a Woodcutter (1-shot vigilante). I have not used my kill yet. Like I've mentioned in the past about the woodcutter, I believe it is much more useful late in the game when there is a good shot at actually hitting mafia. This is why I was quite confident about a serial killer. I am a woodcutter and I know that none of the NKs so far have been from me.
The interesting thing about this is that I did believe Dsell was a Vigilante since Day 2. When I insisted that the second kill Night 1 was not due to a SK, and I hinted that I suspected there was a Vig, Dsell was the one whom I suspected.
However, the basis of that suspicion was that he would killed Theorel, because he had quarreled with theorel, and theorel would appear scummiest to Dsell.
So while I would have believed the claim, it was contigent upon him having killed Theorel, which he claims he did not. Also, i believe I mentioned already today that I suspected Dsell of being the Vig, so he might just be copying that.
So I don't know if I believe this. He would be the second Woodcutter, after Grujah, who is confirmed.