Detractors fail to recognize the sport is no more dangerous than many other combat activities.
The Irishman announced his retirement on Tuesday.
Dana White, UFC president, confirmed McGregor's withdrawal on Tuesday.
The "Wedding Crashers" star gained a white belt in jiu jitsu on Monday.
This is what happens when two unpredictable talkers come together.
Like McGregor, the Californian has a penchant for trash talk.
The Irishman needs a new opponent at the MGM Grand in Las Vegas.
The Irishman will fight for the UFC lightweight belt in March.
The UFC featherweight champion revealed a random drugs test on his Twitter account.
The former heavyweight champion of the world knows what an upset fight loss feels like.
The UFC featherweight champion has been training hard for his latest fight in Las Vegas.
Jones allegedly drove through a red light and hit the side of a car driven by Vanessa Sonnenberg, a pregnant woman.
The mixed martial arts organization is "optimistic" the state will open to live events in 2015.