Whosdunit gamemode

I think this would be a perfect gamemode for League of Legends, you are a group of 10 people, then you play versus one player (the murderer). But no one knows who the murderer is, so you run around on summoner's rift, with reduced vision by a lot, during night-time. And suddenly, one of the players is killed. You have no idea who it is, so the game keeps on going, and then another player dies.

If all the victims survive for 5-10 minutes with the killer, they get to vote for who they think the killer is. The killer controls a victim and the killer, which he/she can kill themselves with, while still playing around as the killer, to reduce suspects towards the killers identity.

This is more or less like the gamemode from Warcraft 3 called: Who is the killer?