what happened to him/her
Dis-moi ce qui lui est arrivé.
Tell me what happened to him.
Personne ne sait ce qui lui est arrivé.
No one knows what happened to him.
Je regrette ce qui lui est arrivé.
I regret what happened to him.
Tu as vu ce qui lui est arrivé ici, pas vrai ?
You saw what happened to him here, didn't you?
— Memories of Murder (2003)
Vous savez ce qui lui est arrivé ?
Do you know what happened to him?
— Retour vers le futur II (1989)
Je sais ce qui lui est arrivé.
I know what happened to him.
Je veux savoir ce qui lui est arrivé.
I want to know what happened to him.
Ce qui lui est arrivé, peut arriver à n'importe qui d'entre nous.
What happened to him could happen to any of us.
— Senna (2010)
Si je rencontre une personne louche, personne ne saura ce qui lui est arrivé.
If I meet a shady person, no one will know what happened to them.
— Old Boy (2003)