Boy, this is extremely sad and shocking news. Saw Don pitch many many times. At Dodger Stadium, and later at Candlestick Park after I moved north and the Dodgers visited SF. Loved Don's work as an analyst for the Braves, too.
Don was a master pitcher; an assessment that has been made by many. Including Gene Mauch. Don's strong clutch outing, when he pitched for the Brewers, beat Mauch's mighty Angel lineup in the '82 ALCS. And Don pitched for Mauch in Anaheim, a few years later. Legendary curveball (and his other "stuff" was great, too), excellent control/"location," and exceptional preparation and smarts. Watching Don pitch was.a study in poise, professionalism, talent, and the art of "setting up" and "finishing off" a hitter.
Thank you, Don. For the terrific pitching and television work, and for providing a wonderful part of the baseball viewing life for so many. Our memories of your play, and presence, will always be long and fond.