MMA star Conor McGregor announced (for the third time) his retirement on June 7, 2020. - Christopher Polk / Rolling Stone / REX / SIPA

Irish mixed martial arts star Conor McGregor, 31, again announced his retirement on Sunday on his Twitter account. "Hey guys, I decided to withdraw from the fight. Thank you all for the incredible memories! What an adventure ! McGregor tweeted.

Hey guys I've decided to retire from fighting.
Thank you all for the amazing memories! What a ride it's been!
Here is a picture of myself and my mother in Las Vegas post one of my World title wins!
Pick the home of your dreams Mags I love you!
Whatever you desire it's yours ❤️ pic.twitter.com/Dh4ijsZacZ

- Conor McGregor (@TheNotoriousMMA) June 7, 2020

This is the third time that the figurehead of the UFC (Ultimate Fighting Championship), the main organizer of MMA fights, has announced that it will end its sports career. McGregor had decided to withdraw from MMA for the first time in 2016, before reversing his decision after negotiating a new, significantly upgraded contract.

The "money fight" against Mayweather

The Irishman, nicknamed "The Notorious", had hung up a second time in March 2019 after suffering a defeat in October 2018 against the Russian Khabib Nurmagomedov. He finally changed his mind in October 2019 and made his return to the octagon in January in Las Vegas by winning in just 40 seconds against the American Donald Cerrone.

McGregor held the UFC featherweight title from 2015 to 2016 and lightweight from 2016 to 2018. But it was while participating in a controversial boxing bout against American legend Floyd Mayweather in August 2017 in Las Vegas that 'he gained worldwide notoriety and wealth. The Irishman has also had problems with the justice system on several occasions. He was notably involved in two attacks in the United States.

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