Bob Probert, for those who do not know, played 16 seasons in the NHL, totaling 163 goals and 285 fights for 3300 penalty minutes in 935 games, and is considered the #1 enforcer of his generation. He could have developed into a top power forward, if it wasn't for his personal demons. He liked drugs. He liked to party. He caused lots of headache for the league and his team, like not being allowed to enter Canada for 3 years because of a drug possession bust. But the team found him worth it and paid him very well to protect the star players. Probert played in the NHL 1985-2002. I could not find complete data, but he made $14,044,000 from 1990 to 2003. In today's league, he would have made 2-4 times as much. When Probert entered the league, he made around $150,000 a season. Today minimum salary is $650,000. The UFC link is Tank. (this is a wrestling clip, but is the only one I know of with Tank and Probert)
You do not think I know? Still not many guys who call Tank fat boy to his face and challenge him to a fight. Clogged artery. Smoking probably did not help. CTE may have done him in later anyway. He only had 2-3 concussions in more than 300 NHL fights (don't know about off-ice fights), but I guess it adds up.