Dayle Haddon, a model and actress who graced many magazine covers in the 1970s and 1980s and who bucked the fashion industry by continuing to model later in life, was found dead on Friday at her daughter’s home in Bucks Countydc188, Pa. She was 76.

The cause was believed to be carbon monoxide poisoning, the authorities said.

Emergency personnel discovered Ms. Haddon’s body at about 6:30 a.m. in a bedroom on the second floor of the house. They also found a man passed out on the first floor, according to the Solebury Township Police Department.

High levels of carbon monoxide were detected at the property, and three emergency responders were treated for carbon monoxide exposure. A faulty flue and exhaust pipe on a gas heating system is believed to have caused the carbon monoxide leak, the authorities said.

Walter Blucas, 76, the man who had passed out, was taken to a hospital in critical condition, according to local authorities and Ms. Haddon’s daughter, Ryan Haddon. Mr. Blucas is Ryan Haddon’s father-in-law.

ImageMs. Haddon in 1983. Later in life, she signed a deal with L’Oréal Paris and traded in swimsuits for professional clothes, becoming a face for brands like Talbots.Credit...Jean-Jacques Lapeyronnie/Gamma-Rapho, via Getty Images

Dayle Pauline Haddon was born in Montreal on May 26, 1948, to Eileen and Edward Haddon. She began taking dance lessons there at age 5 and, as a teen, performed with some of the most esteemed troupes in Canada, including Les Grands Ballet Canadiens. She took on modeling to pay for her classes and found success in it. She was named “Miss Montreal” in her late teens.

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And trying to hold the city together has been Mayor Rob Rue, who took office not even a year ago, taking on a part-time post that has been anything but that over the last several days.

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She is spending far more money than he is — nearly three times more in August.

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