DaJuan Summers scored 15 points—13 after halftime—and no one else scored more than seven for Georgetown (16-13, 7-11).
Walker's 20 points pretty much single-handedly kept DePaul (8-23, 0-18) close. It was his floater in the lane that capped a 9-0 run for the visitors to open the second half and tie the score at 24-24.
But 3-pointers by Summers and Jason Clark helped Georgetown regain momentum.
Indeed, after Walker's bank shot made it 34-31, Summers scored six points and assisted on the other basket during an 8-0 run that put the Hoyas ahead for good.
Walker made a jumper 23 seconds into the game and DePaul did not score another point until he dropped in a baseline floater about 10 1/2 minutes later. That ended a stretch in which the visitors went 0-for-14 on field goal attempts and 0-for-2 at the foul line.
With the Hoyas missing plenty, too, the two teams went 5 1/2 minutes without a field goal by anyone.
Georgetown was up 24-15 at halftime, thanks in part to six points and five rebounds from Greg Monroe, but he didn't attempt a shot in the second half.
The Blue Demons enter the BIG EAST Championship as the No. 16 seed and face ninth-seeded Cincinnati on Tuesday at Noon ET. The game can be seen live on bigeast.tv and heard online at depaulbluedemons.com.
DePaul Drops to 0-18 at Georgetown
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