N.Y. Surr. Ct. Proc. Act § 1415
Supplementary letters, executors not named in letters not to act If the disability of an infant or a noncitizen named as an executor in a will be removed before the administration of the estate is completed he shall be entitled on petition showing the facts to supplementary letters testamentary to be issued in the same manner as the original letters to join in the completion of the administration of the estate with the person or persons previously appointed. A person named in a will as executor shall be deemed to be superseded by the issue to another person of letters testamentary and shall have no power or authority as executor until he or she appears and qualifies and letters testamentary are issued to him or her.
N.Y. Surr. Ct. Proc. Act Law § 1415