Very sad. Nothing from Mike or Dave on Twitter. But that would be expected. God rest his soul.
In this link, you have the story by Pete Smith and a video of Mr. Shula's thoughts and recollections. From his first coaching experiences with the Lions, then of Johnny Unitas to Bob Griese to Dan Marino. He also discusses Paul Warfield, and Larry Csonka, Mercury Morris and Jim Kiick. And of course, he discusses the Undefeated Season:
I moved to this country as a kid. Moved to Michigan. They were still talking about him back then within the Lions organization. Really a coaching legend. And a steakhouse owner! RIP Don.