Desperate gangsters take diners hostage; drifter dies for waitress.
(desperados, in a sense)
...came up with the idea after seeing
Killing Zoe (1994) (not a particularly good film) and infusing a little Morrison, I suppose, and then one day I happen to catch
The Petrified Forest (1936) on cable (it's a good one) and realize it's remarkably similar to my idea.