Model, actress and humanitarian Dayle Haddon died Friday after what police believe was a carbon monoxide leak at a Bucks County, Pennsylvania, home.

Police from Solebury Township in Bucks County, which is in the Philadelphia metropolitan area, began investigating a property at 6:30 a.m. Friday, after a resident called 911 to report a 76-year-old man was lying down, passed out on the first floor of a detached “in-law” suite.

The man was taken to Robert Wood Johnson University Hospital in New Brunswick, New Jersey, according to the police report. His condition was not immediately available. A second victim, a 76-year-old woman, was found dead in the detached suite’s second-floor bedroom.

Eliot Gross, the deputy coroner of Bucks County, confirmed to USA TODAY that the female victim was Haddon. Toxicology reports to determine the cause of death are expected on Saturday, according to Gross.

Volunteer firefighters on the scene detected a “high level of carbon monoxide” in the property, according to the police report. Two medics were transferred to the hospital for carbon monoxide exposure, and one was treated on the scene.

CBS News reported that the home is owned by Haddon’s daughter, former journalist Ryan Haddon, and Ryan’s husband, the actor Marc Blucas.

The Canadian-born Haddon was one of the top models in the 1970s, posing on the cover of the 1973 Sports Illustrated Swimsuit issue. Haddon starred in the 1973 Disney movie “The World’s Greatest Athlete” and in Hollywood films such as 1979’s football satire “North Dallas Forty” along with Nick Nolte.

Haddon worked as L’Oréal spokesperson and was the author of “Ageless Beauty: A Woman’s Guide to Lifelong Beauty and Well-Being.”

Haddon traveled the world as an ambassador for the humanitarian aid organization UNICEF. She is also the founder of WomenOne, a charity focused on creating educational opportunities for girls and women, according to her website.