The trial court erred by submitting to the jury three aggravating factors that had not been alleged in the indictment as required by G.S. 15A-1340.16(a4). The three aggravating factors were that the defendant used a firearm equipped with an unregistered silencing device; the defendant's conduct included involvement in the illegal sale and purchase of narcotics; and the defendant's conduct was part of a course of conduct which included the commission of other crimes of violence against another person or persons.