An Out for Oscar (1963)

Mousy bank teller Oscar Blenny, a guest at a desert casino, is enamored with Eva, a seductive casino hostess, who is having affairs with two male co-workers. With the sinister Bill, she's conniving to rip off the casino. When her superior discovers she's two-timing him, their confrontation turns violent and she kills him. Realizing that Oscar is just outside the room,...