The Huskies did it with defense holding the Bulldogs to a Final Four-record low 18.8 shooting percentage (12 for 64).
Connecticut capped one of college basketball's best postseason runs, winning six games in the NCAA tournament after winning five games in as many days to win the Big East title.
It was the second consecutive year Butler lost in the championship game. Last year they were beaten 61-59 by Duke.
Walker didn't match his 25.0 average in the tournament, but the Huskies didn't need a lot of points playing defense as they did.