1. The issue to be determined by a jury in a self-defense claim is whether the defendant reasonably believed himself to be in imminent danger. Here the expert's testimony was not offered to show the defendant suffered from any mental defect, thereby relieving her of criminal responsibility. Rather, the testimony was offered to explain the reasonableness of defendant's belief that she was in imminent danger from her husband.2. Evidence of the battered woman syndrome is not a defense to a murder charge. The evidence is introduced to help the jury understand why a battered woman is psychologically unable to leave the battering relationship and why she lives in a high anxiety of fear from the batterer. The evidence aids the jury in determining whether her fear and her claim of self-defense are reasonable.