Illinois Letters of Office-Decedents Estate is a document issued by the probate court in the state of Illinois that grants a person authority to act as the legally appointed representative of a deceased person's estate. This document is also known as Letters Testamentary, Letters of Executor ship, or Letters of Administration. It is used to transfer the deceased person's assets to their legal beneficiaries. There are three types of Letters of Office-Decedents Estate: Letters Testamentary, Letters of Executor ship, and Letters of Administration. Letters Testamentary are granted to an executor who is designated in the decedent's will. Letters of Executor ship are granted to a person that the court appoints to serve as executor if the deceased person did not designate one in their will. Letters of Administration are granted when there is no will, or when the will does not name an executor. All three types of Letters of Office-Decedents Estate are issued by the court and allow the appointed representative to access the estate's assets, pay debts and taxes, and distribute the assets according to the decedent's wishes.