Dayle Haddon, one of America's first supermodels, who later gained notoriety as an actress, and humanitarian died in Bucks County, Pennsylvania of carbon monoxide poisoning.

A 76-year-old woman found dead of suspected carbon monoxide poisoning at a historic Bucks County farmhouse property early Friday has been identified as Dayle Haddon, who had a successful career as a model in the 1970s and ‘80s and later became a UNICEF ambassador.

Model Dayle Haddon died in a suspected carbon monoxide leak at the Bucks County home of her son-in-law, Hallmark movie star Marc Blucas, officials said.