The Waterloo Police Department and Monroe County Coroner’s Office are investigating the death of a 30-year-old woman that occurred late Thursday afternoon.

The victim was identified by deputy coroner Bob Hill as Heather R. MacDonald, 30, of Waterloo. Police and EMS personnel responded to the 100 block of North Market Street about 4 p.m. Thursday. Hill said that the coroner’s office requested an Illinois State Police crime scene unit to process the scene due to the nature of the woman’s death. This is a common procedure when dealing with untimely deaths in an effort to rule out the possibility of foul play.

“No cause of death was revealed during the pathological examination,” Hill stated in a news release. “Toxicology tests will be performed.”

Funeral arrangements for MacDonald are pending at Braun Funeral Home in Columbia.