In this article, we'll explain when and how you should terminate your lawyer-client relationship. We'll even provide a sample termination letter.In the disengagement letter, the lawyer should warn the client of applicable time limitations, deadlines, and uncompleted investigation or casework. (2) Notice of Withdrawal. Need to write an attorney closing letter to clients? The purpose of a disengagement letter is to provide notice and document that the firm is withdrawing from an active matter. I am writing this letter to formally notify you of my decision to terminate our attorneyclient relationship effective immediately. Revoking an FPOA in Illinois requires following strict legal procedures. It serves as a professional and ethical marker to indicate the end of a specific attorney-client relationship. What Is a Termination of Representation Letter?