Texas' Tre' Newton has chosen to end his career because of concussion-related problems after having a discussion with his family and doctors over the weekend.
Kansas State coach Bill Snyder also announced on Monday that senior running back William Powell suffered a season-ending injury. Powell did not make the trip to Missouri for Saturday's loss.
Powell leads the nation with an average of over 34 yards per kick return, three yards per return more than the next-best. He also returned a kick for a touchdown against Baylor this year. He's carried 23 times for 250 yards and four touchdowns, leading the Big 12 in yards per carry, at 10.87, for running backs with at least 20 carries this year.
Newton did not play in Saturday's loss to Oklahoma State, but he's run 64 times for 229 yards and three touchdowns, with all three coming in the Longhorns' season opener against Rice.
Newton, his parents and doctors decided it was best for him to not play. The sophomore will stay on medical scholarship and work with the team's running backs in the following seasons.
"He's been fighting a head injury. He's done everything we've asked him to here, an outstanding player for us, he's won some games for us," said coach Mack Brown.
Newton's father, Nate Newton, played professionally for more than 15 years, including six Pro Bowls in 13 seasons with the Dallas Cowboys.
Brown also said he expected Newton to work in the academic center.
"He's been an outstanding person for us, as well as player and he'll be missed on the field, but he'll still have an impact off the field."