Boozer died Saturday after suffering a brain aneurysm Friday while visiting friends in Omaha, The New York Times reported.
Boozer, a 6-foot-8 forward, played 11 years in the NBA and averaged 14.8 points and 8.1 rebounds for six teams in 874 games, the Chicago Tribune reported. He was a member of the Milwaukee Bucks when the team won an NBA championship in 1970-71, his final season.
Boozer, one of the Bulls' 18 picks in the May 1, 1966, expansion draft, averaged 20.4 points and 8.7 rebounds in three seasons with the Bulls and appeared in the 1968 All-Star Game.
The Bulls won 33 games in 1966-67, an expansion team record, and made the playoffs but were swept by the St. Louis Hawks.
Boozer, who had been a two-time All-American at Kansas State, was drafted by the Cincinnati Royals in the first overall pick of the 1959 draft. But he delayed entering the league, playing for the Amateur Athletic Union Peoria Caterpillars so he could retain his amateur status for the 1960 Summer Olympics.
After he left the NBA, the Omaha World-Herald said, Boozer had a successful career with a communications company. He worked as a community affairs executive and a federal lobbyist.
Boozer has a street named after him in his native Omaha.