Mathilde Favier, the longtime public relations director at Dior Couture, has died at the age of 57 following a tragic car accident in western France. Favier died on August 17, 2026, in the Deux-Sèvres region, alongside her husband and film producer Nicolas Altmayer, 61. Her death has prompted an outpouring of grief across France’s fashion and entertainment communities. According to reports, the couple were involved in a serious road collision near Airvault. Their vehicle collided with a truck while overtaking another car, and both Favier and Altmayer died in the crash. French authorities opened an investigation into the circumstances of the collision, including possible involuntary manslaughter.
Favier was one of the most recognizable figures behind Dior’s public image. She joined Dior in 2011 and became closely associated with the fashion house’s relationships with celebrities, models and other prominent personalities. Over the years, she worked with major Dior ambassadors including Natalie Portman, Rihanna and Jennifer Lawrence, earning a reputation for her warmth, elegance and ability to bring people together.
Beyond her professional career, Favier was known for her deep connection to Paris and its culture. She published Mathilde à Paris in 2024, sharing her affection for the city’s fashion, art, gastronomy and creative community. Her family described a woman whose personality extended well beyond her prestigious professional position.
Favier is survived by her children, Héloïse and Carlo Agostinelli, along with her mother, siblings and extended family. A death notice published in Le Figaro confirmed that she died accidentally on August 17 at the age of 57.
Her funeral was held at the Église Saint-Sulpice in Paris on August 31, bringing together family, friends and leading figures from the fashion and cultural worlds. Among those attending were Dior executives and prominent personalities, reflecting the breadth of Favier’s influence and the affection in which she was held.
Dior and its leadership paid tribute to Favier following her death, remembering her not simply for her professional accomplishments but also for the energy, generosity and personal warmth she brought to the fashion house. Her sudden passing, together with that of Altmayer, has left a profound sense of loss among colleagues and friends who knew the couple.
The cause of death was the fatal injuries sustained in the August 17 road accident. There is no indication in the reliable reports reviewed that Favier died from an illness or other medical condition. Her death was the result of the crash that also claimed Altmayer’s life.
Mathilde Favier is now being remembered as a major figure in the world of French fashion, a trusted representative of Dior and a woman whose relationships with artists, designers and celebrities helped shape the public face of one of the world’s most influential luxury houses. Her death at 57 has brought an abrupt end to a career and life that left a lasting impression on Parisian fashion and culture.
