Quatre mouches de velours gris

Aldo Bufi Landi as Pathologist Sandro Dori as Funeral Exhibition Attendant (uncredited) Calisto Calisti as Carlo Marosi Fabrizio Moroni as Mirko Francine Racette as Dalia Ada Pometti as Extra (credit only) Jean-Pierre Marielle as Gianni Arrosio Oreste Lionello as The Professor Stefano Satta Flores as Andrea Pupita Lea Scuderoni as Funeral Exhibition Visitor (uncredited) Maurizio Streccioni as Funeral Exhibition Visitor (uncredited) Mimsy Farmer as Nina Tobias Shirley Corrigan as Girl at Party (uncredited) Quinto Marziali as Funeral Exhibition Visitor (uncredited) Michael Brandon as Roberto Tobias Marisa Fabbri as Amelia, the Maid Bud Spencer as Diomede / Godfrey Franz Colangeli as Funeral Exhibition Visitor (uncredited) Corrado Olmi as Porter Laura Troschel as Maria Tom Felleghy as Police Commissioner Pini Pino Patti as Funeral Exhibition Attendant Renzo Marignano as Funeral Exhibition Attendant (uncredited) Guerrino Crivello as Rambaldi, the Neighbor Gildo Di Marco as Postman Fulvio Mingozzi as Music Studio Manager Dante Cleri as Coffin Salesman Stefano Oppedisano as Bearded guy with girlfriend Jacques Stany as Psychiatrist Luigi Cozzi as Masked Killer in Theater (uncredited) Giovanni Di Benedetto as Funeral Exhibition Attendant (uncredited)

Bruno Nicolai Conductor Franco Di Giacomo Director of Photography Françoise Bonnot Editor Luigi Cozzi Story, Assistant Director Giuseppe Lanci Camera Operator Angelo Iacono Production Manager Carlo Rambaldi Special Effects Massimo Anzellotti Sound Effects Editor Dario Argento Director, Screenplay, Story Roberto Forges Davanzati Assistant Camera Mauro Marchetti Assistant Camera Ennio Morricone Original Music Composer