Appointment with a Shadow

Appointment with a Shadow is a 1957 film noir directed by Richard Carlson. It stars George Nader and Brian Keith.

Paul makes it on time, but in rocky shape. An accident causes his clothing to be soaked in liquor. Hayden arrives with his stripper girlfriend, Flo Knapp, but just as Spencers men shoot him dead, Paul spots the real Hayden, whose face has not been changed at all. Its a setup.Every attempt made by Paul to persuade Spencer and Penny of the mistake goes for naught because they are certain that he was drunk. When he sets about proving Hayden is alive, Flo takes him captive at gunpoint. Only in the end does Spence realize that Paul was right all along. ........

Source: Wikipedia