The Boston Celtics signed Paul Pierce on Monday so that he could retire as a member of the organization. Pierce, a 10-time NBA All-Star, spent the first 15 years of his career with Boston, winning a title in 2008. In announcing Pierce's retirement, co-owner Wyc Grousbeck said Pierce's No. 34 will soon hang in the rafters at TD Garden. "We're honored that Paul has chosen to retire as a Celtic. He is among the very best Celtics -- a champion on and off the court," Grousbeck said in a release. "We congratulate Paul on a Hall of Fame career, and look forward to seeing his number raised to the rafters of TD Garden." The Celtics drafted Pierce with the 10th overall pick in 1998. He finished up his career playing for the Brooklyn Nets, Washington Wizards?and Los Angeles Clippers. "It's an honor to have this opportunity to once again call myself a Boston Celtic," Pierce said in the release. "The organization and city took me in and made me one of their own, and I...