Michel (Jean-Paul Belmondo) is a young petty criminal who models himself on the film persona of Humphrey Bogart. After stealing a car in Marseille, Michel shoots a policeman who has followed him onto a country road. Penniless and on the run from the police, he turns to his American girlfriend Patricia (Jean Seberg), a student and aspiring journalist, who sells the New York Herald Tribune on the streets of Paris. The ambivalent Patricia unwittingly hides him in her apartment as he simultaneously tries to seduce her and call in a loan to fund their escape to Italy. At one point, Patricia says she is pregnant with Michel's child. She learns that Michel is on the run when questioned by the police. Eventually, she betrays him, but before the police arrive, she tells Michel what she did. He is somewhat resigned to a life in prison, and does not try to escape at first. The police shoot him in the street and, after a prolonged death run, he dies “à bout de souffle” (at breath's end).
Source : Wikipedia