Apology for Murder (1945)

Reporter Kenny Blake (Hugh Beaumont) falls in love with scheming Toni Kirkland ('Ann Savage') not knowing that she is married to Harvey Kirkland (Russell Hicks), a man years older than she. By the time he finds out, he is so under her spell that he murders her husband which is what Toni had planned all along. City editor Ward McKee (Charles D. Brown, Kenny's boss and best friend, begins to pursue the tangled threads of the crime relentlessly and gradually closes the net on Kenny. The latter is mortally wounded by Toni, who has deserted him for another man.