I didn't know the name, but he was on the first David Lee Roth album with Steve Vai, Billy Sheehan, and Gregg Bissonette.  And was a long time touring musician with Fleetwood Mac, Stevie Nicks, and Lindsey Buckingham.  Plus gigs with a number of other well know bands.  Rolling Stone has a nice writeup ...

https://www.rollingstone.com/music/music-news/brett-tuggle-fleetwood-mac-david-lee-roth-band-keyboardist-dead-1370965/

Man, that guy did it all. What a great supporting musician. Take your rest, Tug.

One of those "secret weapon" guys for sure. He will be missed.