Torry Johnson led Northern Arizona (0-5) with 24 points on 7-of-19 shooting. He was 7 of 12 from the free-throw line as the Lumberjacks hit only 16 of 28.
In a surprising development, Northern Arizona University longtime football coach Jerome Souers will remain the program's coach, the school announced Monday.
Jay Green ran in three touchdowns, Patrick Tyler carried in two more and Southern Utah clinched the Big Sky Conference title with a 48-20 win over NAU.
Cookus threw for 380 yards and three touchdowns and caught a pass for another score as NAU stunned previously unbeaten Illinois State 37-16 on Saturday.
Jordyn Martin scored 23 points on 8-of-9 shooting from the field and grabbed 14 rebounds, and Northern Arizona held off Montana State with a 69-63 win.