BOSTON, June 1 (UPI) -- Boston Celtics center Shaquille O'Neal announced Wednesday he is retiring after 19 years in the NBA.

O'Neal disclosed his decision to call it quits in a short video on tout.com. He also put a link to the video in a Twitter message.

"We did it. Nineteen years, baby," O'Neal said in the video. "I want to thank you very much, and that's why I'm telling you first. I'm about to retire. Love you. Talk to you soon."

The 7-foot-1 O'Neal, 39, won four NBA titles -- three with the Los Angeles Lakers and one with Miami -- was an all-star 15 times and was the league's MVP in 2000.