A person is justified in the use of force against another when and to the extent he or she reasonably believes that the conduct is necessary to defend himself or herself or another against such other’s imminent use of unlawful force. However, he or she is justified in the use of force which is intended or likely to cause death or great bodily harm only if he or she reasonably believes that the force is necessary to prevent imminent death or great bodily harm to himself or herself or another or the commission of a forcible felony.
(B) In no case shall any act involving the use of force justified under this section give rise to any claim or liability brought by or on behalf of any person acting within the definition of "aggressor" set forth in ILCS Chapter 720, Act 5, § 7-4, or the estate, spouse, or other family member of such a person, against the person or estate of the person using such justified force, unless the use of force involves willful or wanton misconduct.
(ILCS Chapter 720, Act 5, § 7-1) (1981 Code, § 42.07, 7-1)