In this case, the defendant’s accomplice was killed during an attempted armed robbery of 2 men. The State charged the defendant with those offenses, but in the end went to trial on felony murder predicated upon attempted armed robbery. The appellate court reversed because the indictment didn’t identify which attempt armed robbery was the predicate felony for the murder count.
The Illinois Supreme Court reversed the appellate court and reinstated the conviction, finding, reading the indictment as a whole, that the defendant was on notice as to the charge he was defending.
The case is People v. Robert Carey.
http://www.illinoiscourts.gov/Opinions/SupremeCourt/2018/121371.pdf