The Man Who Owed a Death

El hombre que deba una muerte English The Man Who Owed a Death is a 1955 Argentine crime film directed by Mario Soffici and starring Amelia Bence and Carlos Cores.

Back at the manor, Rossi is arrested for trying to poison his wife, but this proves false when he himself drinks the glass he was about to give her. He instead accompanies the police to Reyes home, where they find her dead with a suicide letter next to her the same letter she had written during the game where Leonor had written hers. This alerts Leonor, who waits for her husband knowing he has killed Celina. The police soon find out, and ambush Rossi as he attempts to flee the premises. He is wounded in the ensuring gunfight, and dies telling Leonor that everything was a lie but this that he truly loved her.

Source: Wikipedia