His father and brother were famous actors, his sister married a famous actor and his mother was an haute couture model about whom Cole Porter riffed "You're the top, you're an ocean liner / You're the top, you're Margaret Vyner".
The actor's sister, Joely Richardson, and friends Ralph Fiennes, Alan Rickman, Uma Thurman, Timothy Dalton and Laura Linney were among the mourners.
William Balfour, who was married to the actor's sister Julia and who was also thought to live at the property, has been arrested by police.
The actor's sister, Tamasin, told the BBC her brother had been "amazingly lucky in his career... and he's made incredible choices".
Walker's father, who's the executive of his son's estate, launched the lawsuit following a similar one in September from the actor's sister, Meadow Walker.
The "Pippin" cast will also include the Tony-nominated actors Patina Miller ("Sister Act") as the Leading Player, who narrates the show, and Terrence Mann Les Misérableses") and Charlotte d'Amboise ("A Chorus Line") as Pippin's father, King Charles, and his wife Fastrada, Pippin's cruel stepmother.
Barry carved out a name for herself as a fashion photographer, but in France remained less famous than her actor half-sisters, Charlotte Gainsbourg and Lou Doillon.
Her older sister, actor Dame Joan Collins, 82, said she was completely devastated.
There she found her calling, as well as many friends, including the comic actor Dom DeLuise, her sister, Sarah Comma, said.
The daughter of actor Richard Bennett and sister of actresses Constance and Barbara Bennett, Joan Bennett began her film career at the age of 19.
