Illinois Deceased Joint Tenancy Affidavit is a legal document that must be filed with the county recorder in order to prove the death of a joint tenant and thus dissolve a joint tenancy agreement. This document can be used to transfer ownership of a property from the deceased joint tenant to the surviving joint tenant. There are two types of Illinois Deceased Joint Tenancy Affidavit: one with right of survivorship and one without right of survivorship. The affidavit with right of survivorship allows the surviving joint tenant to take possession of the property without having to go through probate court, while the affidavit without right of survivorship requires the surviving joint tenant to go through the probate court process. The affidavit must include information such as the full name of the deceased joint tenant, the date of death, the property address, the county in which the property is located, and the name of the surviving joint tenant.