O'Neal sent a Tweet shortly before 2:45 p.m. saying, "im retiring." It included a link to a 16-second video in which he says, "We did it; 19 years, baby. Thank you very much. That's why I'm telling you first: I'm about to retire. Love you. Talk to you soon."
Celtics spokesman Jeff Twiss says that O'Neal has not notified the team of his plans.