On February 10, 2007, Shamrock lost his fight by disqualification to Renzo Gracie during the EliteXC event which was televised on Showtime. During the fight, Gracie repeatedly took Frank to the ground, but Shamrock kept active by stopping his positional advance and hitting knee strikes from the bottom. However, Shamrock delivered two of those knees to Gracie's head while both men were on the ground, and after a five-minute injury time out, Gracie was unable to continue. Referee Herb Dean disqualified Shamrock due to a foul (illegal strikes to the back of the head, and knees to the head of a grounded opponent). Dean had already warned Shamrock once earlier in the fight about striking to the back of the head—an illegal move under the Unified Rules of Mixed Martial Arts.