Buffet froid
Alphonse finds his acquaintance killed with his penknife sticking out of his belly. When he tries to report the crime to police inspector Morvandieu, he refuses to listen. Later, Alphonse’s wife is killed. Her killer befriends Alphonse, and the two recruit Morvandieu to commit more crimes with them.
Starring Gérard Depardieu, Bernard Blier, Jean Carmet, Michel Serrault, Geneviève Page, Jean Benguigui, Marco Perrin, Carole Bouquet, Bernard Crombey, Denise Gence
Watch "Buffet froid" from streaming services Amazon Prime, Mubi released in 1979. It's a crime and comedy movie, and has a rating of 7.3 out of 10 from Imdb which is usually fine for this kind of movie.