MUNDELEIN, Ill. — Five members of the same family were found shot to death inside a home in suburban Mundelein, Illinois, on Sunday night, October 18, 2026, in what authorities are investigating as a suspected murder-suicide.

The Lake County Coroner’s Office identified the deceased as James Schmidt, 80, and Rebecca Schmidt, 77, both of Mundelein; Maclaine Schmidt, 22, of Lake Bluff; Nicole Heiser, 37, recently of Antioch and formerly of Lake Bluff; and Bryan Schmidt, 51, recently of Antioch and formerly of Lake Bluff.

According to police, Bryan Schmidt was the son of James and Rebecca Schmidt. Heiser was identified as his girlfriend, while Maclaine Schmidt was his son.

Authorities believe Bryan Schmidt shot and killed his parents, his son and his girlfriend before taking his own life. The investigation remains ongoing, and officials have not publicly established a motive for the deadly incident.

Police responded to a home in the 200 block of Wellington Avenue at approximately 11:45 p.m. Sunday after receiving a request to conduct a well-being check.

When officers arrived, they discovered five people inside the residence who had suffered fatal gunshot wounds.

The Lake County Coroner’s Office subsequently released the identities of the five victims. Investigators are examining the circumstances surrounding the shootings and the events that preceded the discovery.

Authorities are treating the case as a suspected murder-suicide based on their preliminary findings.

The discovery has left neighbors in shock, particularly those who knew the family and remembered the older couple as friendly members of the community.

Neighbor Sam Escobedo said he recalled hearing sounds shortly before noon Sunday that he initially believed were firecrackers.

“We heard firecrackers. Didn’t pay much attention to it; thought it was kids or something,” Escobedo said.

It remains unclear whether the sounds Escobedo heard were connected to the fatal shootings. Investigators have not publicly confirmed when the gunfire occurred.

Neighbors described James and Rebecca Schmidt as retired veterinarians who had built relationships throughout the Mundelein area.

Rebecca Schmidt, 77, reportedly founded the Northern Illinois Cat Clinic in Libertyville in 1982. A graduate of the University of Illinois College of Veterinary Medicine, she established the practice as a clinic dedicated to feline care and operated it alongside her husband, who was also a veterinarian.

The clinic became known among local pet owners, and the couple were remembered fondly by people familiar with their work.

One neighbor described Rebecca as an energetic, approachable woman who regularly walked around the neighborhood and greeted people she encountered.

“She was a spry, retired veterinarian,” the neighbor said. “She was a friendly person. She’d wave to people. She’d have conversations with all kinds of neighbors.”

The neighbor added, “I’m horrified. I’m horrified that this would happen to somebody and somebody that I knew.”

Rosa Bernel, who said she works at a clinic the couple once owned, also expressed sadness over the deaths.

“Very nice people; the best bosses I had in my whole life,” Bernel said.

The deaths of five relatives have raised painful questions for the community as investigators work to determine what led to the suspected murder-suicide.

Although authorities believe Bryan Schmidt was responsible for the shootings before his own death, a motive has not been publicly established in the information available.

The case remains under investigation. Further details may be released as authorities continue reviewing the evidence and reconstructing the events surrounding the tragedy.

The deaths have devastated neighbors and former colleagues who remembered the Schmidt family through their personal relationships and contributions to the local veterinary community.