In Knox v Aronson, Mayefsky & Sloan, LLP, 2018 NY Slip Op 09030 [1st Dept Dec. 27, 2018], the court dismissed a legal malpractice case where the client’s allegations were previously addressed in a prior matter. The court held:
Supreme Court properly dismissed plaintiff’s complaint as against FBK, since the only claim asserted, a legal malpractice claim, is barred by the doctrine of res judicata (see Matter of Hunter, 4 N.Y.3d 260, 269, 794 N.Y.S.2d 286, 827 N.E.2d 269  ). Plaintiff’s legal malpractice claim is based on the same conduct that was the basis of the counterclaim previously dismissed by Supreme Court Westchester County. Res judicata bars all claims “ arising out of the same transaction or series of transactions … even if based upon different theories or if seeking a different remedy ” (Jumax Assoc. v. 350 Cabrini Owners Corp., 110 A.D.3d 622, 623, 973 N.Y.S.2d 631 [1st Dept. 2013] [internal quotation marks omitted], lv denied 23 N.Y.3d 907, 2014 WL 2922240 ). Contrary to plaintiff’s contention, the dismissal in the Westchester action was on the merits. The order addressed the merits of the counterclaim, dismissing it on the basis of the settlement and the custody decision in the matrimonial action (see Plaza PH2001 LLC v. Plaza Residential Owner LP, 98 A.D.3d 89, 98, 947 N.Y.S.2d 498 [1st Dept. 2012] ).