Jeff Bottari/Zuffa LLC via Getty Images Conor McGregor celebrates after knocking out Donald Cerrone in their welterweight fight during the UFC 246 event at T-Mobile Arena on Saturday in Las Vegas. In pictures: Conor McGregor returns to the octagon

Jeff Bottari/Zuffa LLC via Getty Images Conor McGregor celebrates after knocking out Donald Cerrone in their welterweight fight during the UFC 246 event at T-Mobile Arena on Saturday in Las Vegas.

After a year away from the sport, Conor McGregor returned to the UFC on Saturday night and knocked out Donald "Cowboy" Cerrone in a welterweight fight at UFC 246.

It was McGregor's first UFC bout since he was defeated by Khabib Nurmagomedov in October 2018.

Following the explosive end to the fight — with a skirmish between McGregor, Nurmagomedov and the fighters' respective camps — McGregor was handed a six-month suspension and then announced his retirement on social media.