UFC fighter Conor McGregor is in plea negotiations over a backstage brawl earlier this year at the Barclays Center in Brooklyn. Following a brief court appearance on Thursday, his attorneys and attorneys for the Brooklyn District Attorney’s Office both confirmed the talks. McGregor was captured on video attacking a bus full of UFC fighters in April at the nearby arena. “I regret my actions that led to today,” the fighter said outside the Kings County Family Courthouse. He and his co-defendant are out on bail.