What remains unresolved after the crash that killed Nicolas Altmayer and Mathilde Favier?

French prosecutors have opened a judicial investigation after film producer Nicolas Altmayer and his partner, Dior public-relations director Mathilde Favier

The collision occurred at about 16:00 on the D938 in the Deux-Sèvres department, between Thouars and Parthenay. According to the Niort prosecutor’s account reported by Europe 1 and local outlet Niort Info, the couple’s car was travelling on the two-lane side of a three-lane section while the truck approached on the single opposing lane. Altmayer, 61, and Favier, 56, were killed at the scene; the truck driver was uninjured.

Initial findings from the road, the vehicles and witness statements indicated that the truck veered across the continuous line and struck the left side of the couple’s car, the prosecutor said. The driver disputes that account and maintains that the car crossed the line. His alcohol and drug tests were negative, while the truck’s tachograph indicated normal speed and compliant rest periods before the crash. He was placed under formal investigation for involuntary homicide and under judicial supervision. That status is not a finding of guilt, and the investigating judge must now test the conflicting versions through technical evidence and testimony.

Altmayer was a largely behind-the-scenes architect of modern French popular cinema. The French National Centre for Cinema, or CNC, says that he and his brother Éric produced nearly 70 feature films through Mandarin & Compagnie, ranging from Jet Set and Brice de Nice to works by François Ozon, Anne Fontaine, Bertrand Bonello and Julia Ducournau. The brothers produced all three OSS 117 spy comedies starring Jean Dujardin, films whose knowingly reactionary central character became familiar to French-speaking audiences well beyond France.

The Belgian connection is concrete but secondary to the two deaths and the French investigation. Frakas Productions identifies Ducournau’s Alpha as a Belgian minority co-production involving producers Jean-Yves Roubin and Cassandre Warnauts. Its Belgian partners included the Centre du Cinéma et de l’Audiovisuel of the Wallonia-Brussels Federation, RTBF, Proximus, Be tv, Shelter Prod and the federal Tax Shelter system. That network illustrates how films commonly described as French are often built through cross-border European financing, broadcasting and production relationships. No public tribute from those Belgian partners was located at the time of publication.

The public commemorations have consequently used two different lenses. France’s culture minister Catherine Pégard described Altmayer and Favier as contributors to France’s cultural influence, while the CNC emphasised Altmayer’s long-term loyalty to filmmakers and performers. From Belgium, the credits of Alpha reveal a more collaborative reality: national cinema remains an important cultural label, but production itself is frequently Franco-Belgian. This is not an institutional EU matter, and no European Commission body has a role in the criminal investigation; Brussels-based Belgian partners should not be confused with the EU institutions headquartered in the same city.

Favier, meanwhile, was remembered within the fashion world. Dior credited her with an exceptional contribution to the reputation of Christian Dior Couture, and LVMH chief executive Bernard Arnault praised the energy and talent she devoted to the house. Jean Dujardin and François Ozon were among those mourning Altmayer, according to Le Monde and Euronews.

The immediate next step belongs to the French investigating judge. Vehicle examinations, road traces and witness accounts will have to establish which vehicle crossed the dividing line and why. Until those findings are complete, the exact cause of the collision—and any eventual criminal responsibility—remains unresolved.