supplementscene: If there's only 1 death, that likely means the serial killer either doesn't exist or has 1 night bulletrproof.
Or that both mafia and SK targetted the same player, or that either faction was roleblocked, or that the kill from either faction was prevented by a doctor, or that either faction decided to not use their killing ability. Or that both factions were roleblocked, withheld the kill, or were prevented by a doctor, with a town vig being responsible for the death.
What makes the two options you listed more "likely" than all the options I listed combined?
supplementscene: I kind of bet we have an SK though. ZFR put another faction in his last game and I bet he's done it again here.
You don't believe he used random.org? You don't believe he set up the game as specified on the wiki page, but actively decided to put his thumb on the scale?
What makes you think so?
supplementscene: Also does this information you're asking us to research help Mafia or Town more?
Mafia start with a big information advantage. Town should not willfully make that advantage even bigger by ignoring information available to them. There'll be a lot of conclusions that can be drawn as the game progresses; it'll pay to be aware of them.
supplementscene: Perhaps the scumhunting for a Serial Killer is more nuanced but really it isn't.
Why not? I can think of some ways in which mafia could be found out which wouldn't be applicable to a SK. Can't you, or what makes you say this?