UFC superstar Conor McGregor was among a slew of MMA stars to come out in support of Jon Jones following his brother Arthur’s tragic death. Former UFC heavyweight champion Jon Jones suffered an unimaginable loss this week when his eldest brother, former NFL star Arthur Jones, passed away at age 39. Jon Jones retired from the UFC in June before announcing his comeback plans for the UFC’s White House card next year. One such friend was Conor McGregor, who took to social media shortly after the news of Arthur’s death went public. Conor McGregor tributes ‘friendly giant’ following Jon Jones’s brother’s tragic deathIn a recent post to X, UFC superstar Conor McGregor reacted to Arthur Jones’s passing.