Conor McGregor has announced his retirement from "the sport formally known as 'Mixed Martial Art'".
On Tuesday, the 30-year-old posted to Twitter, notifying his seven million followers that he was leaving the combat sport.
"I wish all my old colleagues well going forward in competition," he wrote. "I now join my former partners on this venture, already in retirement.
"Proper Pina Coladas on me fellas!"
The announcement comes five months after the Irish former two-weight UFC champion was defeated by Russia's Khabib Nurmagomedov in October. It was his first fight in the octagon in two years.
It's not the first time McGregor has claimed to be retiring. In April 2016 he tweeted that he'd decided to "retire young" and was not included on the UFC 200 card.
However two days later he issued a retraction, saying he hadn't retired but had fallen out with UFC bosses over promotional work.
In September 2018, he launched an Irish whiskey brand, and UFC President Dana White made comments to media that seemed to imply McGregor's departure from the sport was imminent.
In recent days he had mentioned a possible return to the UFC in July.
Many on Twitter seem sceptical that McGregor is actually retiring, with some speculating it's a promotional move to build anticipation for a 'comeback' fight in the near future.
In more recent news, McGregor "is under investigation in Ireland after a woman accused him of sexual assault in December, according to four people familiar with the investigation." - via the New York Times.
The allegations have not been proven and the fact that an investigation is continuing does not imply that McGregor is guilty of a crime.
McGregor's team have since made a statement on the matter: "This story has been circulating for some time and it is unclear why it is being reported now.
The assumption that the Conor retirement announcement today is related to this rumor is absolutely false.
Should Conor fight in the future it must be in an environment where fighters are respected for their value, their skill, their hard work and their dedication to the sport"