I'd had a feeling he was sick, the last time I saw him being interviewed.
He had a wide range, comedy and drama and action, and the toughest of them all, a mix of the three. Garner was better than almost anybody else at comic exasperation. Plus he was one of the first TV actors, along with Steve McQueen, to jump successfully to movies. He realized Warners was making one heck of a lot of money off their actors in "Maverick" and "77 Sunset Strip" and so forth, while paying even the lead actors peanuts, and he bucked their system and won.
RIP, Mr. Garner. Like your contemporary Bob Culp, I'm sure you'll have a lot of stories to tell in heaven.