If you’re a fan of Downton Abbey, you may remember her instantly. Now, French cinema is saying goodbye to one of its most celebrated stars.

Nathalie Baye has died at the age of 77, her family confirmed. She passed away at her home in Paris on April 17 after living with Lewy body dementia, a progressive neurodegenerative disease that affects memory, movement, thinking, and can also cause hallucinations. Multiple outlets, including AFP, Reuters, AP, and People, reported the family’s confirmation.

Lewy body dementia develops when abnormal protein deposits build up in nerve cells in the brain, disrupting both mental and physical function. It has also affected other public figures over the years, including Robin Williams, Estelle Getty, and Casey Kasem. Baye’s diagnosis adds another heartbreaking name to that list and casts a sad light over the final chapter of a life spent in front of the camera.

Over the course of a career that lasted more than five decades, Baye became one of the defining faces of French cinema. She appeared in more than 80 films and earned four César Awards, the French equivalent of the Oscars. Among those honors were three consecutive acting wins in the early 1980s, a remarkable achievement that confirmed her status as one of France’s most respected performers.

Although she had long been revered in France, Baye also found international recognition later in her career. Global audiences may know her best as Leonardo DiCaprio’s mother in Steven Spielberg’s Catch Me If You Can. More recently, she appeared in Downton Abbey: A New Era as Madame de Montmirail, bringing her signature elegance and quiet authority to the role. The film was well received and became a commercial success worldwide.

Born in Normandy in 1948 to painter parents, Baye’s path into acting was anything but conventional. She struggled in school with dyslexia and dyscalculia and left formal education at 14. Before acting claimed her attention, she first pursued dance and moved to Monaco to study it, a decision that would eventually lead her toward performance. Later, she trained in drama and built the foundation for what would become one of the most admired careers in European film.

She once reflected on her upbringing with characteristic honesty and understatement:

“I was brought up with very few rules, so that what rules there were I really respected. I was sensible and well-behaved, actually.”

Her breakthrough came in the 1970s, when she began working with some of the most influential filmmakers in France, including François Truffaut, Jean-Luc Godard, and Maurice Pialat. Her performances in films such as La Balance and The Return of Martin Guerre helped establish her reputation for emotional intelligence, restraint, and quiet force. She never relied on theatricality. Instead, she built characters from the inside out, which is part of what made her so enduring.

Beyond the screen, Baye’s personal life also drew public attention. She had a high-profile relationship with French rock legend Johnny Hallyday, and their daughter, Laura Smet, later followed her into acting. Baye is survived by her daughter and grandson, along with countless admirers shaped by her work across generations.

Among those most deeply affected by her death is director Thierry Klifa, who had been one of her closest friends for 25 years. Speaking after her passing, he described a friendship built on loyalty, warmth, and lasting affection. He recalled that their bond began after an interview in 1999, when she unexpectedly called him back to say she had enjoyed their conversation and suggested they go to the theater together. That simple gesture, he said, was entirely in character.

Klifa’s tribute was especially moving because it captured not just the actress, but the woman behind the acclaim.

“She was loyal to her friends, and I stayed loyal to her until the very end.”

He also remembered her joy, her generosity, and the energy she brought into a room:

“She was the queen of laughter.”

That may be one of the most fitting ways to remember Nathalie Baye. She leaves behind a body of work that shaped French cinema, crossed borders, and reached audiences far beyond her home country. But she also leaves the memory of a presence that, by all accounts, was luminous, generous, and unmistakably alive.