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.
Gonzaga has signed California transfer Jordan Mathews to a financial aid agreement for the 2016-17 season.
Coach Gilmore on CWS win: 'It's indescribable' Coastal Carolina head coach Gary Gilmore reflects on his 21 years as head coach and is proud of how far the program has come.
Two late June events provided a great start on the 2020 class and a look at some new 2019 talent.