This film is not the getaway (at least the Mcqueen one, I haven't watched the newer one).

Set in 70s or 80s America
A guy whos pretty handy with guns, possibly a sniper or shooter, finds a load of money, goes on the run with a girl.

Money kept in a locker possibly at an airport.

They have a crash as people are chasing them, she dies, film ends with him shooting possibly 2 police men or gangsters, and her dying in his arms.

Any ideas?