C's waiving J.O., closing in on Williams?

ESPN.com's Marc Stein reports:

The Boston Celtics, seeking some added depth for their frontcourt, are closing in on the signing of free-agent center Sean Williams, according to sources with knowledge of the deal.

Sources told ESPN.com that the former Boston College center, waived by the Dallas Mavericks in March, is scheduled to join the Celtics in Atlanta and will be in uniform for Boston's game Friday night against the Hawks.

To make roster room for Williams, Boston is waiving the injured Jermaine O'Neal, sources said.

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