Crawford scores 19, blocks potential tying 3 to lift Northwestern past Purdue 63-60 in 2 OT

Fans of Northwestern support Purdue as members of the Purdue men's basketball team pause for a moment of silence before their NCAA college basketball game against Northwestern in Evanston, Ill., on Tuesday, Jan. 21, 2014. There was a shooting on their campus earlier in the day. (AP Photo/Matt Marton) (The Associated Press)

Northwestern guard Tre Demps (14) and Northwestern guard/forward Sanjay Lumpkin (34) blocks Purdue guard Bryson Scott (12) during the first half of an NCAA college basketball game in Evanston, Ill., on Tuesday, Jan. 21, 2014. (AP Photo/Matt Marton) (The Associated Press)

Drew Crawford scored 19 points and blocked the potential tying 3-pointer at the buzzer to lead Northwestern to a 63-60 double-overtime victory over Purdue hours after a shooting on the Boilermakers' campus on Tuesday.

Crawford scored four points in the second OT and delivered the big block on Ronnie Johnson off an inbounds pass as time expired to preserve the win.

Tre Demps added 19 points, and the Wildcats (10-10, 3-4 Big Ten) prevailed on an emotional night for the Boilermakers (13-6, 3-3).

An engineering student opened fire inside a basement classroom at Purdue earlier in the day, killing a teaching assistant, and there was a moment of silence before the game.