The Strange Love of Martha Ivers (1946)

Young Martha (Barbara Stanwyck) inadvertently causes the death of her cruel, authoritarian aunt. Martha lies to the cops, and Walter (Kirk Douglas), who saw the crime, corroborates the girl's story. Eventually, they wed out of convenience; the meek Walter is genuinely in love, and Martha thinks that her secret is safe since she has married the one witness to her aunt's death. However, when her childhood pal, Sam (Van Heflin), shows up, Martha knows her dark past may not stay a secret for long.