"Clue" on Tv right now… Mr. Body killed because he was blackmailing Col. Mustard and all the rest. In final reveal of method and unmasking, it is broughtforth other victims (in movie; the cook etc…) were accomplices that found secretive datum with which to create blackmail leverage…. Also all the guests / suspects related to each other even if link not obvious from their standpoint…. paralells just sayin.