Nevada State Athletic Commission (NSAC) has appointed veteran referee Herb Dean as the third man inside the cage for the UFC 173 championship main event between Renan Barao and TJ Dillashaw. In addition, cageside judges will be Derek Cleary, Chris Lee and Tony Weeks. Dean called the Brazilian's last title defense, which ended in a bit of controversy. Will history repeat itself over Memorial Day Weekend? Photo by Ethan Miller.