Model, Hallmark star dead at 76 after suspected carbon monoxide leak in Pennsylvania home

Dayle Haddon, who modeled for decades while also maintaining a dual career as an actress, has died at 76.

Haddon, who had starred on screen with Nick Nolte at the height of her career, died as a result of suspected carbon monoxide poisoning, NBC10 in Philadelphia reported on Friday.

The Bucks County emergency dispatch reportedly got a call around 6:30 a.m. that day after a man was spotted lying passed out on the floor of a detached in-law suite in Solebury Township, Pennsylvania.

First responders also discovered an unresponsive woman in a second-floor bedroom of the home, who was later identified as Haddon.

The man, who's identity has not yet been revealed, was rushed to a hospital, but Haddon was pronounced dead at the scene after first responders attempted to revive her.

Police told ABC6 that fumes from a faulty boiler may have been responsible for the deadly carbon monoxide levels.

'It is believed a heating unit, a boiler unit, is the source of the carbon monoxide. The initial readings on EMS and fire company arrival were extremely high, so we're treating this as a carbon monoxide poisoning incident,' Detective Sergeant Jonathan Koretzky of the Solebury Township Police Department said.

The main house on the property was reportedly not affected by the alleged gas leak.

The home was apparently still dangerous to first responders, as two paramedics were reportedly taken to a hospital for carbon monoxide exposure, while a police officer was treated at the scene.