Video footage has leaked online which shows UFC Lightweight contender Donald Cerrone accidentally knocking out one of his sparring partners.
Watch the above video to witness “Cowboy” Cerrone going too far and knocking his sparring partner out cold.
Cerrone makes his return to the Octagon at UFC 187, as he takes on Khabib Nurmagomedov in Las Vegas, Nevada on May 23, 2015.
