The Unfaithful (1947).

Zachary Scott, Ann Sheridan, and Lew Ayres
in The Unfaithful (1947)

In The Unfaithful, Ann Sheridan claims that she killed an intruder in self-defense, but evidence emerges that she was more than well acquainted with the dead man. Lew Ayres, Zachary Scott, Eve Arden, and Jerome Cowan costar. The film is based on "The Letter" by Somerset Maugham (compare with the Bette Davis version), with a screenplay by David Goodis.