WHEATON, Ill. (AP) — A fourth suburban Chicago teenager has been charged in the grisly slaying of another teen who was strangled, stabbed, set on fire and run over with a vehicle earlier this month.

In a news release, the DuPage County State's Attorney's Office says 18-year-old Saul Ruiz of West Chicago was charged this week with first-degree murder. Already charged with first-degree murder are 18-year-old Francisco Alvarado of West Chicago and 16-year-old Tia Brewer of Wheaton. Prosecutors also announced that 18-year-old Jesus Jurado Correa of West Chicago, who was originally charged with concealing a homicide, has been charged with first-degree murder.

The four are suspected in the Aug. 13 slaying of 18-year-old Luis Guerrero of West Chicago, whose still smoldering body was found in a field in unincorporated Wheaton the next day.