"Robert (Turner) was off his game all night," Smith said. "He was pathetic all night long."
Turner turned the ball over for the fifth time in the final second with a chance to tie or take the lead.
It was the culmination of several missed opportunities for the Red Raiders who have now lost four-straight games.
"This is about as frustrating a game I've been around in a long time. It's really disappointing as I can be with the way we performed and the way we executed."
Texas Tech shot 36.5% from the field in the loss missed a dozen shots in the paint.
"When you miss 12 layups and you are avoiding contact the way we did tonight. It tells me something about your lack of toughness."
The Red Raiders visit Baylor on Saturday at 12:30 p.m.