Dupree said in a statement issued by the school Monday that he made "a selfish decision" and hopes he will be forgiven.
Coach David Richman said Dupree is a member of the Bison family and will be supported. But he also said Dupree is returning with "some adjusted expectations," and it hasn't been decided whether he will play again this season.
Before leaving, Dupree had played in 17 games and was averaging 7 points, 3 rebounds and 2 assists. The Milwaukee native is best known for coming off the bench and scoring four straight points in overtime to spark an 80-75 win over Oklahoma in the 2014 NCAA tournament.