An investigation is underway in Oak Grove surrounding the death of two residents.

According to Police Chief Bob Muenz, Donald and Mary Halsey were found Friday at their home in the 2600 block of South Broadway street. “At this time, we believe they died from carbon-monoxide poisoning. It was an unfortunate accident and our hearts go out to the family,” Muenz said.

Police said they believe a car was left running in the home’s garage, causing the home to fill with carbon monoxide.