Although Jean-Louis Trintignant has been retired since 2003, he only comes back to working on films if Michael Haneke is directing. He considers Haneke the greatest director alive and would act for him in any film (in both big and smalls roles). Michael Haneke also considers Trintignant one of his all time favorite actors (along side with Marlon Brando).
The trivia item below may give away important plot points.
Trintignants character Georges tells his granddaughter Eve that he killed his wife four years ago by suffocating her, apparently to release her from unbearable circumstances. In Liebe (2012), also directed by Michael Haneke, Trintignant played a husband named Georges who eventually suffocated his wife with a pillow as an act of releasing her from incurable sickness. The recurring motif of killing a beloved relative on request in Hanekes works has an autobiographical reference. According to him, his aunt who was suffering once approached him about euthanasia, when he was younger.