The Reckless Moment (1949)

After discovering the dead body of Bea Harper's lover, Bea's mother Lucia hides the body under the assumption that it was her daughter who killed the man. Martin Donnelly comes to blackmail Lucia on behalf of his partner Nagel and falls in love with Lucia instead. Nagel wants the money and Donnelly kills Nagel to protect Lucia, and then kills himself to end the impossible relationship with the married Lucia.