Just went to look Bill Young up because I couldn't remember what year he was at Miami (2008 btw) and saw he passed away last March...wild. only 3 years after retiring
He def wasn't fired from LSU. Based on this article he left on his own to go to Auburn and LSU apparently tried to keep him
https://www.google.com/amp/s/www.theadvocate.com/baton_rouge/sports/lsu/article_7ee72209-66d1-5b1d-817f-a7dd0f4e36e2.amp.html