Shaquille O’Neal announces retirement via Twitter

"I really, really thought about coming back," he said, "but this Achilles is very damaged and if I had it done the recovery would be so long we'd have same outcome as this last year -- everyone sitting around and waiting for me.
"I didn't want to let people down two years in a row. I didn't want to hold Boston hostage again.

"I'm letting everybody know now so Danny (Ainge) and the organization can try to get younger talent. I would love to come back, but they say once the Achilles is damaged it's never the same. I don't want to take that chance."