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.
Kendrick Nunn, who pleaded guilty to misdemeanor domestic battery last week, has been dismissed from the Illinois basketball team.
Delaware has hired Notre Dame assistant Martin Ingelsby as its next men's basketball head coach, sources told ESPN's Jeff Borzello.
Michigan State-Duke in the ACC/Big Ten Challenge will pit two of the best recruiting classes in the nation. Here's a look at all the games.