new horror game

[SPELLSLINGER]

i have a thought for a live-action RPG. somehow you would decide who is the murderer (without anyone knowing). that person would then murder as many people as possible by things described by the players. the other players would try to kill the murderer.

[Narmical]

There are already a bunch of LARP games with this kind of theme.

Like those "mistery dinner party" kits.

What makes yours diffrent?
What are the mechanics?