"There's clearly no threat from anyone in the vehicle," Sheriff Murphy said. "There's no reason for Mr Monahan to feel threatened."

"There's clearly no threat from anyone in the vehicle," Sheriff Murphy said. "There's no reason for Mr Monahan to feel threatened."

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The friends drove away from the house and attempted to call for help in a nearby town, but Ms Gillis was pronounced dead by paramedics.

Mr Monahan was "unco-operative with the investigation and refused to exit his residence to speak with police", the sheriff's office said in a news release.