Police Monday released the identities of the couple that died of carbon monoxide poisoning this weekend.

Ceferino Jarin, 91, and Elizabeth Jarin, 89, were found unresponsive in their Boyds home Saturday.

Family members told responders that Elizabeth Jarin believed the smoke alarm was going off and that her husband was unable to reach it.

Investigators later determined the alarm was a carbon monoxide detector.

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Emergency workers pronounced the couple dead at the scene and found a vehicle running inside the garage that likely elevated carbon monoxide to lethal levels, according to a fire department social media post.

No additional victims were found and firefighters ventilated the home.

Carbon monoxide, known as the “invisible killer”, is a colorless, odorless, poisonous gas. More than 150 people in the United States die each year from accidental, non-fire-related carbon monoxide poisoning, according to the Consumer Product Safety Commission.

Experts recommend installing and maintaining carbon monoxide alarms in a central location outside each sleeping area and on every level of the home. More safety information is available from the U.S. Fire Administration at https://www.usfa.fema.gov/.