After Beasley missed a 3-pointer in the final second, the student section rushed the court to celebrate Nebraska's second victory over a Top 25 opponent this season. The other one was against Oregon in December.
Kansas State (18-7, 8-3), which would have moved into a three-way tie for the Big 12 lead with a win, pulled to 65-64 on Blake Young's 3-pointer with 4:46 left. The Wildcats wouldn't score again ended up losing their third straight on the road.
Beasley finished with 17 points and 10 rebounds to tie Carmelo Anthony's NCAA freshman record of 22 double-doubles.
Beasley was coming off 40-point, 17-rebound performance in 100-63 win over Missouri on Saturday, but he never could find a rhythm against the Cornhuskers (15-9, 4-7).
Aleks Maric had 15 points and 17 rebounds for the Huskers. Ryan Anderson added 11 points.
Jacob Pullen had 15 points, Bill Walker 12 and Young 10 for the Wildcats.