UFC star Conor McGregor, one of the biggest names in sport, is under investigation in Ireland after a woman accused him of sexual assault, according to reports.

The New York Times reports that the alleged assault occurred in December. The Irishman has not been charged but is under investigation the newspaper reports.

Yesterday McGregor claimed he is retiring from MMA after a turbulent 12 months in and out of the octagon.

The 30-year-old said on Twitter he had decided to retire "from the sport formally known as "Mixed Martial Art".

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Conor McGregor. Photo / Getty Images.
Conor McGregor. Photo / Getty Images.

"I wish all my old colleagues well going forward in competition," he added.

McGregor was defeated by Khabib Nurmagomedov in a UFC lightweight title bout in October after which a brawl broke out with members of the Russian's support team arrested.

McGregor was arrested and charged with robbery in Miami earlier this month after allegedly stamping on a fan's mobile phone.

And in April 2018, McGregor was filmed throwing a steel dolly through a bus window in Brooklyn, which had a number of UFC staff and fighters on board.

Multiple people were injured in the incident, including fellow UFC fighters Michael Chiesa and Ray Borg, who suffered injuries and had to be removed from their scheduled fights.

McGregor reached a plea agreement with the District Attorney. He originally faced a possible 12 criminal charges, including two counts of criminal mischief.

His plea agreement included paying full restitution to the bus company for damages, completing five days of community service and attending an anger management programme.

McGregor, from Crumlin, Dublin, was a trainee plumber on the dole 10 years ago, but rose quickly through the ranks of the UFC and became one of the sport's leading fighters, winning world titles in two weight divisions.

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At the peak of his stardom in August 2017, he reportedly earned $100 million for a boxing match with another combat superstar, Floyd Mayweather Jr, in Las Vegas.