Conor McGregor walks in the cage before fighting Khabib Nurmagomedov in a lightweight title mixed martial arts bout at UFC 229 in Las Vegas, Saturday, Oct. 6, 2018. (AP Photo/John Locher)
Conor McGregor walks in the cage before fighting Khabib Nurmagomedov in a lightweight title mixed martial arts bout at UFC 229 in Las Vegas, Saturday, Oct. 6, 2018. (AP Photo/John Locher)
UFC superstar Conor McGregor announces retirement from MMA
Irishman became first fighter in UFC history to hold titles in two weight divisions but has not fought since his defeat to Khabib Nurmagomedov in October
