The Misfits (1961)

Roslyn Taber (Marilyn Monroe) is a recently divorced, beautiful woman, living in Reno, Nevada. She happens to meet Guido (Eli Wallach), who in turn introduces her to his friend Gay Langland (Clark Gable). Gay is an aging cowboy, who rustles mustangs for a living along with both Guido and another drifter cowboy Perce Howland (Montgomery Clift). Roslyn and Gay begin falling for each other and things seem to finally be going well for her. That is until she finds out what Gay and his rustler partners plan to do with the horses that they are preparing to rustle up.