(Waterloo, IL) — Authorities are investigating the death of a 39 year old St. Louis man found unresponsive in a Metro East jail in Illinois. Police say the victim was discovered around 9:30 Monday morning in a Monroe County Jail cell. He was pronounced dead at the hospital. Monroe County authorities hadn’t identified the man as of Tuesday night. The Monroe County Sheriff’s Department says the man was being held at the jail in Waterloo, Illinois, on “various charges and a warrant for his arrest out of Missouri.” Authorities say an autopsy was conducted but the man’s cause of death was pending toxicology tests. Illinois State Police is investigating.