I saw this movie at or before 1954. I associated it with Suddenly but it is not that movie. The last or nearly last scene is a shootout among bad guys in a room in which they previously played poker. One guy walks away alive and all others are dead. Film noir. It might be Crime Wave but doesn’t seem to fit.
Thanks for any help.
I think this might be Stanley Kubrick’s The Killing.
Here’s a description of the plot: https://en.wikipedia.org/wiki/The_Killing_(film)#Plot
And a clip: https://youtu.be/Tg3A7u83stA