He is the son of former University of Louisville and National Basketball Association player Milt Wagner[1] and left the NBA early into his career because of debilitating health problems.

Wagner attended Camden High School, where he played with the varsity team freshman year.

[3] In his sophomore year, Dajuan played in 17 games and had a new career-high of 57 points against Pennsauken Tech on January 26.

[2] For his senior year he debuted on December 15 scoring 36 points against Eastern, followed by a 50-points performance against Bishop Eustace.

He scored a season-high 32 points against Old Dominion on November 14, 2001, in his 2nd game with Memphis, and tied his season high on March 26, 2002, against Temple during the NIT semifinal.

Wagner's colitis condition was not amenable to medication and, after consulting with New York Knicks head coach Larry Brown, who referred him to a New York medical expert, he underwent surgery to remove half his colon on October 25, 2005, at Mount Sinai Hospital.

[1] On November 20, two months after he recovered from a serious illness to make an NBA comeback, the Warriors bought out his contract after he had played one game for the team.

[16][17] Averaging 8.3 points in six games, he returned to South Jersey after hurting his hip and reinjuring his knee in Poland.