A high-profile Long Island defense firm has been disqualified from representing a suspended attorney accused of stalking his ex-wife and trying to steal from her after a judge concluded a name partner advised the complainant in the same case.

District Court Judge Helen Voutsinas in Nassau County ruled that Barket, Marion, Epstein & Kearon in Garden City was conflicted in its representation of Dominic Barbara on charges that the once-prominent divorce lawyer tried extorting money from his ex-wife, Leslie Barbara. The judge held that Ms. Barbara's attorney-client privilege attached in Bruce Barket's dealings with Ms. Barbara before prosecutors pressed their case.