The Woman in the Window (1944)

His family packed off to Maine, Professor Richard Wanley (Edward G. Robinson) is anticipating some quiet time alone. Then he meets Alice (Joan Bennett), the model for a portrait he admires, and can't resist her offer of a drink. No sooner do they get to her place, however, than her jealous boyfriend arrives in a rage. Richard kills him in self-defense, and they decide to hide the body. Things go smoothly until Richard's D.A. friend invites him to tag along on the investigation of his own crime.