Peterson, who was injured in last weekend's loss to Texas A&M, will undergo season-ending knee surgery in the next couple of weeks, Miles said. An MRI on Monday revealed that Patterson had torn the anterior cruciate ligament in his knee.
The 6-foot-2, 250-pound defensive end led the team with four quarterback sacks.
Junior Jerry Don Bray, who began the season as the starter, will replace Peterson in the starting line-up.
Williams, the All-American cornerback and outstanding punt returner, is still nursing a broken forearm. He broke the arm in the Cowboys' win over Iowa State and has missed the last two games. The Cowboys were hoping to have him back for this weekend's game in Columbia, Mo., but Miles said Tuesday night on his radio show that Williams would not be available.
Junior Daniel McLemore has started in place of Williams against Colorado and Texas A&M.
Peterson, Williams Out<br>Against Missouri
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