Illinois Petition For Probate Of Will and For Letters Of Administration With Will annexed is a legal document used to initiate probate proceedings in the state of Illinois. The document is used when a decedent passes away and leaves a valid will. The petition is filed with the court by an executor or an interested party, such as a spouse or relative, who wants to be appointed as the executor of the estate. The petition must include the name, address, and domicile of the decedent, the date of death, a description of the assets and liabilities of the decedent, the name and address of the executor or interested party, a description of the will and other related documents. Once the petition is filed, the court will appoint an executor and grant Letters of Administration with Will annexed, which give the executor the authority to manage the estate. Types of Illinois Petition For Probate Of Will and For Letters Of Administration With Will annexed include: 1. Petition for Probate of Will 2. Petition for Letters of Administration with Will annexed 3. Petition for Letters of Administration without Will annexed 4. Petition for Letters of Administration with the Will annexed and Bond.