Citing collateral estoppel where a law firm client’s underlying fraud claim was ruled to be without merit, an appeals court has tossed out the client’s malpractice action against the firm despite a lower court ruling that the firm’s named partner and the client’s previous counsel had demonstrated “egregious lack of diligence” by not timely serving a summons with the underlying complaint.

An Appellate Division, First Department panel has ruled that the legal malpractice lawsuit launched by plaintiff Ricky Zegelstein, a Nassau County-based anesthesiologist, against her former attorney, Richard Roth, and his boutique firm, must be dismissed because a federal judge decided that her underlying fraud action levied against other physicians over medical-care billing had failed to state a claim.