Illinois Deposition Of Witness To Will is a legal process in which a witness is questioned concerning the execution of a will or other testamentary document. This deposition can be used as evidence in the probate proceedings. There are two types of Illinois Deposition Of Witness To Will: Non-contesting and Contesting. Non-contesting Deposition Of Witness To Will is used when a witness is testifying that the will in question was executed in accordance with the law. The purpose of this deposition is to establish the validity of the will. Contesting Deposition Of Witness To Will is used when the witness is testifying that the will was not executed in accordance with the law. The purpose of this deposition is to invalidate the will. In both types of deposition, the witness is questioned under oath and the answers are recorded in a deposition transcript.