The deaths of five adults who were found inside a home in north suburban Mundelein following a welfare check were ruled a murder-suicide, authorities said Monday.

About 11:45 p.m. on Sunday, the Mundelein Police Department responded to a well-being check at a home in the 200 block of Wellington Avenue after a concerned relative wasn't able to reach one of the victims. When officers entered the home, they found three men and two women dead inside.

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The five adults appeared to have died as the result of gunshot wounds, the Lake County Coroner's Office said. Two handguns were found at the scene.

Police said all five individuals were believed to have been shot at close range with a handgun.

Authorities said two victims resided at the address. Four of the people who died were family members, while the fifth was believed to have been in a domestic relationship with the suspect, police said.

Video and photos captured at the scene overnight showed officers and other law enforcement officials walking in and out of the home at the corner of Prairie and Wellington avenues. Mundelein police vehicles could be seen, along with evidence technicians from the Lake County Major Crimes Task Force.

Mundelein Police, the Lake County Coroner and the Lake County Major Crimes Task Force were at the scene Monday, with officers spotted walking in and out of the home in the north suburb.

The incident appeared to be isolated, police said, and there is no threat to the public.

Early Monday morning, police could be seen blocking off the home and a car parked in a lot nearby.

As of Monday afternoon, the Lake County Coroner's Office was performing autopsies and working to identify the victims, authorities said.

The incident remains under investigation by the Mundelein Police Department, The Lake County Major Crimes Task Force and the Lake County Coroner's Office.
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