This Man Must Die (1969)

"This Man Must Die" is a 1969 Drama movie directed by Claude Zidi and starring by Michel Duchaussoy, Caroline Cellier. When his young son is killed in a hit and run accident, Charles Thenier resolves to hunt down and murder the killer. By chance, Thenier makes the acquaintance of an actress, Helène Lanson, who was in the car at the time of the accident. He then meets Helène’s brother-in-law, Paul Decourt, a truly horrible individual.