I'm gunna start now... I'll post it up when I got it ready.
EDIT: Got it done now. I'll attach an image. The 'murder game' is a crossword. The suspects are on the right, and you have to fit them into the grid to 'clear' them. One of the suspects won't be cleared and is the 'killer'. It's just a idea I'm trying out, so tell me what you think (and, of course, who you think the Killer is).