Dayle Haddon, a supermodel who graced countless magazine covers and appeared in popular TV shows and films, passed away at 76. Authorities report that she died on Friday in Solebury, Pennsylvania, due to an apparent carbon monoxide leak.

According to the Solebury Township Police Department, Dayle Haddon was found deceased on Friday morning in a second-floor bedroom of a detached office and in-law suite at a local residence. A 76-year-old man, Walter J. Blucas, was discovered unconscious nearby and is currently hospitalized in critical condition. Walter J. Blucas is the father of actor Marc Blucas.

Per the Police investigation “indicates a faulty flue and exhaust pipe on a gas heating system caused the carbon monoxide leak.”

“The officers and members of the Solebury Township Police Department wish to extend our sincere condolences to the Haddon and Blucas families,” the statement continued. “This tragic incident serves as a stark reminder of the importance of carbon monoxide safety precautions in our homes.”