Authorities responded to the home on Chestnut Avenue around 5:40 a.m. Thursday.
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A 59-year-old man was found dead inside of the garage, inside of a car.
Someone called 911 from inside the home.
"Bernardsville, for an update, they're now saying they can't get him out of the car, unable to do CPR," said Somerset County EMS and Fire in the 911 call. "Starting CPR now..."
A 51-year-old woman, a 17-year-old boy, and a 9-year-old girl were all taken to Morristown Memorial Hospital for suspected carbon monoxide poisoning.
Their conditions are not yet known.
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The incident is under investigation.
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