Illinois Statutes Chapter 735. Civil Procedure § 5/8-201. Dead-Man's Act

(a) If any person testifies on behalf of the representative to any conversation with the deceased or person under legal disability or to any event which took place in the presence of the deceased or person under legal disability, any adverse party or interested person, if otherwise competent, may testify concerning the same conversation or event.

(b) If the deposition of the deceased or person under legal disability is admitted in evidence on behalf of the representative, any adverse party or interested person, if otherwise competent, may testify concerning the same matters admitted in evidence.

(c) Any testimony competent under Section 8-401 of this Act, is not barred by this Section.

(d) No person shall be barred from testifying as to any fact relating to the heirship of a decedent.

As used in this Section:

(a) “Person under legal disability” means any person who is adjudged by the court in the pending civil action to be unable to testify by reason of mental illness, an intellectual disability, or deterioration of mentality.

(b) “Representative” means an executor, administrator, heir or legatee of a deceased person and any guardian or trustee of any such heir or legatee, or a guardian or guardian ad litem for a person under legal disability.

(c) “Person directly interested in the action” or “interested person” does not include a person who is interested solely as executor, trustee or in any other fiduciary capacity, whether or not he or she receives or expects to receive compensation for acting in that capacity.

(d) This Section applies to proceedings filed on or after October 1, 1973.