This one really hurts. I grew up with Maverick and I've seen every episode of The Rockford Files at least 10 times. I can easily play the opening music in my head. The same pleasure goes for his western movies like Support Your Local Gunfighter/Sheriff.
I noticed in his obit that he was married for 58 years (to the same wife). That has to be a Hollywood record. It tells me that he was likely much the same offscreen as on - a really good guy.
They just don't make 'em like him anymore.