Butler (18-6, 8-3 Big East) built a 20-point lead in the first half, shooting 60 percent from the floor and going 5 of 6 on 3s.
Down 50-32 with 16 minutes left, DePaul (12-13, 6-6) went on an 18-5 run. Forrest Robinson scored eight of his nine points during the burst.
Dunham then made another 3 as the Bulldogs outscored the Blue Demons 17-7 to stay in control.
Copyright 2015 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.