By Gary Washburn, Globe Staff

The Celtics announced this afternoon that they have waived Keyon Dooling after the veteran guard decided to retire from the NBA. Dooling agreed to a one-year deal at the veteran's minimum in July and was expected to enter the season as Rajon Rondo's primary backup.

Dooling, a member of the executive committee of the NBA Players Association, has decided to walk away from the game after 12 seasons. Dooling was the No. 10 overall pick in the 2001 Draft by the Orlando Magic and was traded to the Clippers on draft night. He played with the Clippers, Heat, Magic, Nets, Bucks and Celtics.

"Keyon has decided that he has given the NBA twelve good years and that it's time to pursue other interests and spend more time with his family," said Dooling's representative Kenge Stevenson in a team statement. "He will never forget his time in Boston with the Celtics."

The Celtics are likely to seek a true backup to Rondo as training camp begins next week.

"We'll miss Keyon's spirit and energy, both on and off the court," Celtics President of Basketball Operations Danny Ainge said in a statement. "The whole Celtics family wishes him well as he enters the next phase of his life."

Dooling played 46 games last season, averaging 4 points and 1.1 assists, proving to be a valuable commodity as the season progressed. He also served as a mentor for Rondo.