725 ILCS 5/115-3: Trial by the Court.

(a) A trial shall be conducted in the presence of the defendant unless he waives the right to be present.

(b) Upon conclusion of the trial the court shall enter a general finding, except that, when the affirmative defense of insanity has been presented during the trial and acquittal is based solely upon the defense of insanity, the court shall enter a finding of not guilty by reason of insanity. In the event of a finding of not guilty by reason of insanity, a hearing shall be held pursuant to the Mental Health and Developmental Disabilities Code to determine whether the defendant is subject to involuntary admission.

(c) When the defendant has asserted a defense of insanity, the court may find the defendant guilty but mentally ill if, after hearing all of the evidence, the court finds that:

(1) the State has proven beyond a reasonable doubt that the defendant is guilty of the offense charged; and

(2) the defendant has failed to prove his insanity as required in subsection (b) of Section 3-2 of the Criminal Code of 2012 and subsections (a), (b) and (e) of Section 6-2 of the Criminal Code of 2012; and

(3) the defendant has proven by a preponderance of the evidence that he was mentally ill, as defined in subsections (c) and (d) of Section 6-2 of the Criminal Code of 2012 at the time of the offense.