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Conor McGregor's ex-coach, pro MMA fighter Jonathan Dargan, kills retiree in Dublin street fight

Just over a year ago, professional mixed martial arts (MMA) fighter Jonathan Dargan was using his proficiency in Taekwondo to help Ultimate Fighting Championship (UFC) featherweight phenom Conor McGregor prepare for Dennis Siver in Boston.

"It's great having Johnny around," SBG Ireland head coach John Kavanagh said prior to UFC Fight Night 59. "He's a hero to all the guys. I have never seen anyone that can move as fast as Johnny Dargan. He's got some freak genetics. I'd love for a scientist to measure his output, because it's absolutely bizarre what that man can do.