Her body was found Sunday by her husband, Thierry Funck-Brentano, in their swimming pool, according to the "New York Times," which cited French news agency Agence France-Presse. The cause of death was unknown, but authorities do not suspect foul play.
Born May 10, 1944, in French Indochina, Pisier was discovered by Truffaut at age 17 when she auditioned for the role of Collette in "Antoine and Collette," which was part of the anthology film "Love at 20."
The director briefly left his wife and children for a short-lived relationship with Pisier, who revived the Collette role for two more of Truffaut's films: 1968's "Stolen Kisses" and 1979's "Love on the Run," which she co-wrote.
She also worked with several other New Wave and post-New Wave directors, including Andre Techine, for whom she appeared in three films: 1975's "French Provincial," 1976's "Barocco" and 1979's "The Bronte Sisters."
In 1977, she made her U.S. debut in "The Other Side of Midnight" but did not find as much success Stateside as in her homeland.
She most recently appeared in 2010's "Il Reste du Jambon?" (Is There Any Ham Left?).
– The Hollywood Reporter