The Illinois Petition For Probate Of Will and Letters Of Administration W-Will annexed is a document used for the probate of a will in the state of Illinois. It is a formal request for the court to approve the will of a deceased person, as well as appoint an executor to manage the deceased's estate. The Petition must be signed by all the heirs of the deceased, including any spouse, children, or other close relatives. The Petition must also be accompanied by a certified copy of the will and any other supporting documents. Once the Petition is approved, the court will issue Letters Of Administration W-Will annexed, which serve as the official legal document that authorizes the executor to act on behalf of the deceased's estate. There are two types of Illinois Petition For Probate Of Will and Letters Of Administration W-Will annexed: Uncontested Petitions and Contested Petitions. An Uncontested Petition is one in which all the heirs agree to the terms of the will and the appointment of the executor. A Contested Petition is one in which some heirs do not agree to the terms of the will or the appointment of the executor.