A man and a woman were found dead in a home in the 500-block of North Avenue just after 4:10 p.m. Tuesday.
The Daily Herald said the Lake County coroner's office identified them as Harry Burroughs, 69, and his daughter, Kathryn Burroughs, 35.
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An autopsy performed Wednesday found both died of asphyxia, the report said. Harry Burroughs' death was ruled a suicide and Kathryn Burroughs' death was classified as a murder.
Neighbors said a couple and their adult daughter, who is thought to have special needs, lived in the home for several years.
"I've seen a lady coming out of her house, looking real sad, hugging a cop. They put her in a car," said Melissa Blach, who lives nearby.
The Cook County Major Case Assistance Team assisted Barrington police in the investigation.