Bonanza Boomers

Roy Coffee is one of my favorite Cartwright friends! And I've read some fanfic where his character has been active. I "know" from somewhere that he was married once with a wife named Mary, but I can't remember if that was a piece of info from a Bonanza TV ep or someone's creative imagination at work in fanfic. I just don't remember!

I am wondering what was the background info on Roy that we were given on the show. Did the script writers ever elaborate?