Olukemi, Oklahoma State top Iowa State 96-87 in OT
Olukemi hit 12 of 12 from the foul line, and his three-point play in the final minute helped the Cowboys force overtime.
Keiton Page, who scored 19 points, hit the game-tying 3-pointer with 23 seconds left. Marshall Moses had 18 points and 10 rebounds, while Roger Franklin scored 13 for the Cowboys (14-4, 2-2 Big 12).
Diante Garrett led the Cyclones (14-5, 1-3) with 25 points. Jamie Vanderbeeken hit 6 of 9 from 3-point territory and scored 20. Jake Anderson added 17 and Bubu Palo 11.
Tied at 84 with 2:30 to play in overtime, Olukemi and Franklin teamed for a steal that Franklin finished with a dunk. An offensive rebound and put-back by Markel Brown gave the Cowboys an 88-84 lead with 32 seconds remaining.