An Act of Murder (1948).

Frederic Marsh and Florence Eldridge in An Act of Murder

When the wife (Florence Eldridge) of a judge (Eldridge's real-life husband Frederic Marsh) is diagnosed with an incurable illness, the judge makes a difficult decision. Costars include Edmond O'Brien and Geraldine Brooks. The film is based on Ernst Lothar's The Mills of God (1935).