The Longhorns have put together some bad halves of basketball this season, but this one is a beaut.
Texas hit only 8 of 33 field-goal attempts in the first half as host Oklahoma State led 30-18 at halftime in a game crucial to the Cowboys' NCAA Tournament hopes.
A.J. Abrams led the Longhorns with six points at halftime and Damion James had only four.
James Anderson had 11 and Marshall Moses 10 for the Cowboys.
OSU expanded its lead to 36-21 early in the second half.