Reggie Spencer finished with 13 points and Walker added 11 to help Northeastern (18-10, 13-3) guarantee at least a share of its first-ever CAA regular season title.
After David Walker converted a jumper with 3 seconds left to make it 66-64, Davis missed a 3-pointer with 1 second left to seal Northeastern's victory.
Northeastern shot 50 percent (8 of 16) while holding James Madison to 41.4 percent (12 of 29) in the second half.
Davis led the Dukes (15-13, 9-6) with 21 points.
Former Kentucky guard Ed Davender, the only Wildcat with at least 1,500 points and 400 assists, has died. He was 49.
Guard Naz Mitrou-Long, whose 2015-16 season ended in December due to hip problems, has been granted a hardship waiver for the coming season, Iowa State said.
As the Sooners look to life without superstar Buddy Hield and his sidekicks, it's clear their unseasoned players will need to grow up fast.