Yes, this actually happened about a month ago. We were all stunned. Even though I've only been a steady player for about a year, I have felt the enormity of this loss. Brad helped shape not just an amazing world, but also a real community that is still going today, even if it's a teeny-tiny bit smaller than it once was.
If you play Live and can get to East Karana easily, there is (or at least was) a monument to his character Aradune. Instructions here:
https://old.reddit.com/r/everquest/comments/e66kex/ingame_tribute_to_brad_mcquaid/