A Canadian supermodel was found dead and an unidentified man was hospitalized after a suspected carbon monoxide leak at a million-dollar home in Pennsylvania on Friday.

According to 6ABC News, Dayle Haddon, 76, was found in a second-floor bedroom of a detached in-law suite in a home in the 6900 block of Phillips Mill Road in Solebury Township, Pennsylvania.

First responders who arrived at the home at 6:30 a.m. Friday initially found a 76-year-old man lying semi-conscious on the first floor of the home. He was taken to a nearby hospital before emergency responders learned Haddon was still inside.

Efforts to revive Haddon were unsuccessful and she was pronounced dead at the scene.

According to the New Hope Eagle Volunteer Fire Company, the property has “high levels of carbon monoxide.”

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In addition to the man who was taken to the hospital, two medical professionals were also taken to the hospital due to exposure. An officer was also treated for his injuries at the scene and all three were in stable condition, police said.

The police believe that a malfunction in the heating system led to the high carbon monoxide levels.

“A heating unit, a boiler, is believed to be the source of the carbon monoxide,” said Det. Sgt. Jonathan Koretzky of Solebury Twp. said the police. “The initial readings when EMS and firefighters arrived were extremely high, so we are treating this as a carbon monoxide poisoning incident.”

The “old farmhouse” dates back to 1711 and is owned by Haddon’s daughter Ryan Haddon, who is a journalist, and her son-in-law, Hallmark actor Marc Blucas, according to 6ABC News. It was purchased in 2012 for $1 million and completely restored, Blucas told Wide Open Country.

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Ryan Haddon posted a tribute to her mother on Friday.

“She lifted up so many people, recognized that their greatness was sometimes hidden from them, and always used her own connections to build bridges to help them rise,” her daughter said. “She was everyone’s greatest champion. An inspiration for many.”

The former supermodel has signed four contracts with major cosmetics companies throughout her career, including Revlon, Max Factor, Estée Lauder and L’Oréal.

She appeared on the covers of Vogue, Elle and Cosmopolitan, and Sports Illustrated in 1973.

“I always trust the timing of things,” Ryan continued. “There are no accidents and certainly how we enter and leave this world is mystical and unknowable. She was a generous spiritual being who valued the development of her soul, so I know that her journey here in this dimension must have been complete.”

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According to her website, Haddon wrote two books, was a UNICEF ambassador and founded the New York-based charity WomenOne, whose goal is to give every girl in the world access to quality education.

“The bright light that is Dayle has grown dimmer in this earthly realm,” Ryan continued in her tribute. “I have no doubt that I am shining as brightly as ever somewhere where it is needed most.

“She was a woman in her power, yet gentle and attentive to everyone. Deeply creative and curious, endowed with inner and outer beauty. Always friendly and attentive.”