Helen Ramirez' man?
He asked her if she would like him to give Kane a hand.
It seems like there must be an interesting character background there.
Who was he supposed to be?
Are you talking about the man at the beginning of the movie? That's Lloyd Bridges as Harvey Pell, Kane's deputy. As we can see, Ms. Ramirez also has had relationships with Kane and Miller. She must have been feeling a lot of pressure that day.
"I'm in such bad shape, I'm wearing prescription underwear." Phyllis Diller 1917-2012
No. The older gentleman that she sent to fetch her partner in the store.
While standing inside her door, he asks Helen if she wants him to give Kane a hand. My perception is that he is a retired gunfighter/sheriff, but it is never explained.
I do know Lloyd Bridges! I grew up watching Sea Hunt.
That's Tom London who has appeared in 500 or so films. Your perception is right - he was an old time gun man.
All I want from you is silence - and mighty little of that