725 ILCS 5/115-1 : Rights and Remedies — Criminal Procedure — Code of Criminal Procedure of 1963 — Proceedings at Trial — Trial —1 - Method of Trial TEXT PDF All prosecutions except on a plea of guilty or guilty but mentally ill shall be tried by the court and a jury unless the defendant waives a jury trial in writing. 725 ILCS 5/115-1 P.A. 87-410.