McGregor was unable to continue after the first round, and will undergo surgery on Sunday.
A report in The New York Times claims that the UFC star sexually assaulted a woman in Ireland.
"It's a little early for April Fools," ESPN's Jorge Sedano quipped.
He was charged with robbery and criminal mischief.
FYI, Jackie Chan is Chinese, not Japanese.
The UFC star "went bananas" and shattered a window, injuring other fighters.
The undefeated boxer confirmed his retirement after besting UFC lightweight champion Conor McGregor on Saturday night.
Floyd Mayweather beat the Irishman with a technical knockout in the 10th round.
Even "Grey's Anatomy" star Jesse Williams couldn't resist a good jab.
"Endurance wins. Score one for boxing."