Police say the deaths appear to be an isolated murder-suicide involving four relatives and a fifth person in a domestic relationship.
MUNDELEIN, IL — Neighbors in a quiet suburban community were struggling to understand how five adults came to be found fatally shot inside a Mundelein home, where police say preliminary evidence points to an apparent murder-suicide.
Officers discovered three men and two women after responding about 11:45 p.m. Sunday, Oct. 18, to a well-being check at a home in the 200 block of Wellington Avenue. A concerned relative had contacted police after being unable to reach one of the people inside, authorities said. Investigators have said four of the deceased were family members and the fifth was believed to have been in a domestic relationship with the person suspected in the killings.
Police have not publicly identified the five people or said which person they believe killed the others before dying by suicide. A motive also has not been released. Authorities said two of the people lived at the Wellington Avenue home, and investigators recovered two handguns from the scene. The Lake County Coroner’s Office was conducting autopsies and working to confirm the identities of those who died.
The discovery stunned residents along Wellington Avenue and nearby Prairie Street, where neighbors described the area as peaceful and the couple who lived at the home as quiet and friendly. Debbie Wunluck, who lives on Wellington Avenue, called the violence “such a shock” and said such incidents were not something residents expected in the neighborhood.
Another nearby resident, who did not give her name to the Daily Herald, remembered the woman who lived at the home as kind and fond of cats. “I’m still in shock,” she said. Other neighbors told local news outlets that the couple who lived at the house were retired veterinarians and that the woman was known for taking walks, waving and stopping to talk with people in the neighborhood.
Some residents also recalled hearing noises earlier Sunday that they initially dismissed as fireworks or firecrackers. Neighbor Samuel Escobedo told WBBM Newsradio he heard what he thought were firecrackers roughly 12 hours before police arrived for the well-being check. NBC Chicago also reported that neighbors heard similar sounds around the time a Chicago Bears game began Sunday afternoon. Police said they had not received reports of gunshots from the area before officers were sent to the house.
Authorities have not said whether those sounds have been definitively connected to the deaths. Mundelein Deputy Police Chief Rick Wilfenger said officers entered the home and found the victims in several rooms. Police said their department had no history of emergency calls from the residence and no known history of police interactions with the people who died.
The investigation continued Monday with detectives and evidence technicians working at the home and speaking with people in the neighborhood. Officers also examined a Volkswagen sedan in the parking lot of the neighboring Kristan Funeral Home. Authorities have not publicly explained whether anything found in or around the vehicle was connected to the investigation.
The Mundelein Police Department said its preliminary investigation indicates the five deaths were an apparent murder-suicide and that the incident appears to have been isolated. Police said there is no continuing threat to the public. Mundelein detectives, the Lake County Major Crime Task Force and the Lake County Coroner’s Office remain involved as authorities work to establish the full sequence of events and formally identify the deceased.
Author note: Last updated October 20, 2026.