Peterson has a knee injury

STILLWATER, Okla. -- Nathan Peterson, the leader in sacks for No. 22 Oklahoma State, will miss the rest of the season after suffering a knee injury against Texas A&M, according to published reports.

An MRI exam showed the freshman tore his anterior cruciate
ligament and will need surgery to repair the damage, the Tulsa
World and The Oklahoman reported Wednesday, citing anonymous

Cowboys coach Les Miles would not comment on Peterson's injury
after practice Tuesday. On Monday morning, Miles said he had gotten
good news but the MRI was Monday afternoon.

Peterson leads Oklahoma State with four sacks and six tackles behind the line of scrimmage. Other Cowboys linemen have just two sacks

Peterson injured his knee in the second half of the Cowboys'
36-20 loss Saturday night to Texas A&M. He left the field on
crutches and has not practiced since.

Peterson is expected to undergo surgery later this month and likely will not return to contact football until August 2005.

The Cowboys also likely will be without cornerback and punt
returner Darrent Williams when they play Missouri Saturday.
Williams has a fractured forearm that is now in a protective wrap.