Illinois Petition For Letters of Administration is a legal document used to request the appointment of an administrator of an estate in the state of Illinois. The petition is filed with the probate court in the county where the deceased person's estate is located. The petition is typically filed by a close relative of the deceased person, such as a spouse, adult child, or sibling, and must include detailed information about the deceased person's assets, liabilities, and heirs. Depending on the circumstances, there are two types of Illinois Petition For Letters of Administration: 1) General Letters of Administration, and 2) Special Letters of Administration. General Letters of Administration is used when there is no will or when the will does not name an executor. Special Letters of Administration may be used when the will does name an executor, but they are unable or unwilling to act.