IRVING, Texas — Kevin Williams ran 84 yards, carrying a football, full pads and 311 pounds. That can tax a fellow. Especially when it's all for naught. The all-pro Minnesota Vikings defensive tackle, the best NFL player from Oklahoma State since Barry Sanders, returned a Tony Romo fumble almost the length of the field. But the return was wiped out by a holding penalty, and Williams was plain wiped out. Williams knelt on one knee in the end zone for the longest time. He was soaked with cold water after returning to the bench. He didn't rejoin his defensive unit the next time Dallas got the ball. And finally, Williams headed to the locker room before halftime, where he was given an IV. "I was just too hot,” Williams said. "Got a head start on cooling off. "I wish I knew it was going to be called back. I would have loved to stop running. "Took a toll on me. When I turned around, none of my guys had run down with me. I knew something had happened.” Williams already has a touchdown this season, on a 54-yard interception return against Atlanta. Sunday, he had a first-quarter sack of Romo, but that was his lone tackle, although Williams returned to play the second half.