Example scenarios for terminating your attorney-client relationship. Includes a sample termination letter form.The purpose of a disengagement letter is to provide notice and document that the firm is withdrawing from an active matter. An attorney withdrawing representation must submit a motion to withdraw to the division, and receive a division order granting the motion to withdraw. Consequently, an insurer's failure to send a reservation of rights letter, standing alone, is not a waiver of the insurer's right to deny coverage for a claim. An attorney may withdraw from representing a party only upon written motion for good cause shown. Many forms in Texas are not available in a fill-in-the-blank format. ' The letter being from plaintiff's attorney to defendant, neither of the objections is tenable. Military. Military Affidavit. This form is used as proof to the court that a custodial or noncustodial parent is in the military.