Murder.io is certainly one of the most fun murder games on the net. It's the sequel to Killer.io, now enjoying killing people in 3D.
Move around the house taking victims, setting traps and avoiding detection. If you are caught in the act, the police will arrest you, giving your opponents a head start. The player with the most deaths at the end of the game wins. Play against players from all over the world in this fun themed online murder game.