Betrayed (1985)

In this 'film-noir' on double identity and role reversal, a man is looking for a woman to love. He finds her in a seedy bar and persuades her to marry him. The day she decides to flee, he kills her. To ward off suspicion, he moves in with the sister of the deceased. Nobody notices the substitution, that his wife is now another. How easy to go from one love to another... But a friend of the dead woman starts asking questions.