Controversial MMA star Conor McGregor has announced his retirement from the sport. The 30-year-old fighter is still suspended for five months after losing to Russian Khabib Nurmagomedov in a Las Vegas title fight that sparked an infamous brawl between the rival camps. On Twitter early Tuesday, McGregor announced: “Hey guys quick announcement, I’ve decided to retire from the sport formally known as ‘Mixed Martial Art’ today. I wish all my old colleagues well going forward in competition. I now join my former partners on this venture, already in retirement.” McGregor is one of the most successful MMA stars in the history of the sport, but his time as a pro fighter has been repeatedly hit by trouble. In 2018, he was ordered to have anger-management training and perform five days of community service by a court after he had attacked a bus containing rival UFC fighters. In another incident this month, McGregor was arrested in Florida after smashing a fan’s phone.