Sean Sherk has left the building, NSAC is looking for him By Steve Cofield Sources within the MGM Grand Garden Arena say that Sean Sherk has left the building. No, he's not bailing on the postfight press conference. The former UFC lightweight champ left the arena with his gloves, shorts and fight gear. No big deal, right? Wrong. It is a big deal. Sherk needed to be present to potentially take a postfight urine test following his loss to Frank Edgar. Nevada State Athletic Commission director Keith Kizer said Sherk was seen in the last 20 minutes ago in the area of the Hard Rock Hotel Casino. The Hard Rock is located roughly 1/2 mile to the east of the MGM Grand. UPDATE: After a 15 minute absence, "The Muscle Shark" returned to the MGM. Kizer said had he not returned to possibily take a postfight urine test, he faced suspension. He did not have to submit a urine sample, he was not on the prefight list fighters.