Hello there, The Ox Bow Incident. I'd also throw Broken Lance (1954) into the mix. It's a western remake of House of Strangers with Spencer Tracy in place of Eddie Robinson, with both screenplays written by the ubiquitous Philip Yordan There is also The Gunfighter (1950) with Gregory Peck as a former gunfighter who can't escape his past reputation. Come to think of it, if we transposed so many of these westerns from 1880 Arizona to 1947 NYC they would all be considered "noir". A stetson for a fedora, a rifle for a 45 and a horse in place of a 1947 Caddie and most westerns can be considered noir, or so I've always thought.