Mathilde Favier, Dior's longtime director of public relations, died Monday in a car accident in western France that also killed her companion, French film producer Nicolas Altmayer. She was 57.

What Happened

According to the Niort public prosecutor's office, the crash occurred around 4 p.m. on a departmental road in Airvault, in the Deux-Sèvres region, when the vehicle Favier and Altmayer were travelling in collided head-on with a truck while attempting to overtake another car. Both were pronounced dead at the scene. French authorities have opened an investigation into the accident, standard procedure for a fatal road collision of this kind.

Dior confirmed her death in a statement Tuesday, describing it as accidental and calling Favier "an exceptional woman whose communicative joy, talent and loyalty were exemplary."

A 14-Year Career at the Heart of Dior

Favier had served as Dior's director of public relations for 14 years, a tenure during which she became one of the most recognisable figures in luxury-fashion communications — responsible for the house's relationships with celebrities, actors, and the run of iconic runway shows that define Dior's public image each season. LVMH chairman and CEO Bernard Arnault said he was "deeply saddened to learn of the tragic and sudden passing" of Favier, praising the years she devoted to "putting her passion, energy and talent at the service of the house of Dior." Christian Dior Couture CEO Delphine Arnault said simply that Favier "loved life with a passion."

Her path into fashion began young: Favier moved in fashion circles from her teenage years, when her uncle Gilles Dufour — who worked alongside Karl Lagerfeld — helped secure her an internship at Chanel. She went on to work at Glamour and Prada before joining Dior, where she remained for well over a decade. She was also the half-sister of Victoire de Castellane, Dior's creative director of fine jewelry, placing her within one of French fashion's more prominent extended families.

Beyond her corporate role, Favier had built a substantial public following of her own — 242,000 Instagram followers — driven in part by her 2024 coffee-table book "Living Beautifully in Paris" (published in French as "Mathilde à Paris"), which shared her perspective on French entertaining and lifestyle culture.

Nicolas Altmayer's Own Legacy

Altmayer, Favier's companion, was a noted French film producer in his own right, best known for producing the hit comedy franchises "Brice de Nice" and the "OSS 117" spy-comedy series — two of French cinema's most commercially successful comedic properties of the past two decades. His death alongside Favier marks a significant loss for French film production circles as well as for the fashion world mourning her separately.

A Sudden Loss for the Industry

Tributes from within Dior and the broader luxury sector have centered on Favier's warmth and relational skill — qualities that defined her approach to a role built almost entirely on personal trust and long-term relationships with talent, journalists, and cultural figures. Her death leaves a sudden vacancy in one of the most visible public relations positions in global luxury fashion, at a house whose public image she helped shape for well over a decade.