The shocking mass murder-suicide in a notoriously safe Illinois village was committed by a veterinarian who gunned down his elderly parents, son and girlfriend before shooting himself dead, according to cops who said he left  multiple suicide notes. 

Bryan Schmidt, who managed his family's now-shuttered cat clinic, was identified as the deranged killer who slaughtered his family in the Mundelein home he owned with his parents, Rebecca Schmidt, 77, and James, 80, who were among the dead.

Bryan's 22-year-old son, Maclaine Schmidt, was also found dead with a gunshot wound to the head, as was the killer's longtime girlfriend, Nicole Heiser, 37, with the bodies found in numerous different rooms.

4 Bryan Schmidt killed his parents, his son, and his girlfriend in a murder-suicide on Sunday, according to cops. YouTube/PostcardMania

Bryan Schmidt then killed himself by putting the gun in his mouth, CBS News reported, citing coroners.

 Multiple suicide notes  were  left by Bryan on scene and in his vehicle,  police said, without elaborating on what they said or a possible motive for the bloodbath.

Authorities said they are combing through a  significant amount  of evidence. However, they have yet to suggest why Schmidt, who ran the Northern Illinois Cat Clinic in Libertyville, would wipe out his family in a crime that shocked the suburban Chicago village of Mundelein, which has a crime rate 63% lower than the national average

He never had any interaction with cops, who had never been called to the house before.

4 Schmidt killed his mother, retired vet Rebecca Schmidt, 77. Northern Illinois Cat Clinic

4 Schmidt also killed his son Maclaine Schmidt. Facebook/Kyle Covalsky

4 Nicole Heiser, Schmidt's longtime girlfriend, was also murdered. Facebook/Nicole Heiser

Authorities suspect the mass killing happened between 11 a.m. and 2 p.m. Sunday - but neighbors assumed the gunshots were firecrackers being set off ahead of Sunday's Chicago Bears game.

The bodies were only found just before midnight when the killer's 44-year-old sister, Kimberly Schmidt, called from her home some 2,000 miles away 
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