Teddy Allen, who scored 12 of his 18 after halftime, hit a 3-pointer to forge a 58-58 tie with 3:49 remaining. Allen was 0-for-7 from beyond the arc up to that point. He was fouled on a 3 and made all three free throws with 1:56 to go as the Aggies led 63-60.
Washington State (7-4) was unable to inbound under the basket and turned the ball over, it's 17th turnover, with 24.9 seconds left.
Michael Flowers led the Cougars with 15 points, tying a season high with five 3-pointers, Noah Williams added 13 points.