By Kristen Johanson

PHILADELPHIA (CBS) — It’s been nearly a week since Philadelphia’s District Attorney was indicted on federal corruption charges, and now it seems there is a shake up as to who will continue to represent him through court proceedings.

In a motion filed late Friday, Michael Diamondstein, the lawyer representing Seth Williams said because of ethical conflicts, he can no longer represent Williams, while he serves as District Attorney.

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Diamondstein writes that due to quote, unique nature and circumstances of this case, he would only be able to represent Williams on a limited basis.

The long-time criminal defense attorney said he’s been consulting with an ethics attorney as to how to proceed and will wait for the Judge to make a decision.

Court documents also reveal that while Williams was under a grand-jury investigation, before charges were formally filed, he was being represented by another attorney John Pease, a lawyer paid for by the city.

Williams has not yet said whether he plans to resign from office.

A pre-trial conference is scheduled for this week.