One man is dead and another hospitalized in critical condition after they were found unresponsive last week in an Almont Township pole barn, police said. An autopsy revealed carbon monoxide poisoning was the cause of the death, investigators said in a statement Wednesday.

The Butler County Coroner’s Office reports two men and a woman were found dead shortly before 5 p.m. Tuesday at the home in Butler, 35 miles north of Pittsburgh.

Called “the silent killer”, carbon monoxide can be extremely dangerous and completely unrecognizable at first. Upstate Medical’s director of poison control, Vincent Calleo, gave out some helpful tips on how to stay safe.

Three people were found dead in a home in Butler County due to suspected carbon monoxide poisoning, authorities said. First responders were called to a home on College Street in Butler at around 5 p.m.

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