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.

The model and actress Dayle Haddon has died at 76 after a suspected carbon monoxide leak, NBC10 in Philadelphia reported; seen in 2016 in NYC

Haddon was a ground-breaking model who worked well into her senior years, blazing a trail for other aging models. She also had a successful acting career, particularly in the ’70s and ’80s; pictured in 1986