Police spent close to 20 hours at a home near West Chicago, but the DuPage County Sheriff's Office wouldn't release any details.
A part-time police officer in west suburban Wayne was found dead Monday in her home.
The DuPage County Coroner's Office confirmed Amy Ruff was discovered around 4 p.m. Monday in her residence on Wiant Road in unincorporated West Chicago.
The preliminary cause of death appears to be a self-inflicted gunshot wound, according to the DuPage County Major Crimes Task Force. A death investigation is ongoing.
Officers from Warrenville, Villa Park and Bloomingdale arrived Monday to investigate the incident and spent 20-plus hours at the home, but they initially released no details. Earlier Tuesday yellow crime tape circled the home, and technicians carried out brown bags of evidence.
Neighbors told NBCChicago the woman's husband also works in law enforcement, as an employee of the DuPage County Sheriff's Office.
One neighbor said he noticed something was wrong late Monday.
"We came home and saw the squad cars and ambulance and fire truck," said Ross Hughes. "We don't know what happened, but we'd like to know."
Hughes said that because the couple is in law enforcement they kept an eye on the neighborhood.
"When they came home, they would look around. Very nice people, never said any bad things or anything. Just model people."