Holy Cross opened the game on a 12-2 run spurring the Crusaders to a 31-24 halftime lead.
The Red Foxes battled back early in the second half, stealing the lead back on a Khallid Hart layup with 15:21 to play. Marist extended its lead to 52-46 with 10 minutes left when Holy Cross went on its final run, taking the lead back for good on another Alexander 3-pointer with 7:22 left.
Marist had a final chance to tie, but Kristinn Palsson missed a 3 with one second left.
Hart had 21 points, Palsson fishished with 15 for Marist.