It was later confirmed that Sophie survived and even showed up again in a deleted scene where she watched Arthur's murderous appearance on Live With Murray Franklin. But after everything Arthur did, why did he choose to not kill Sophie? Arthur's killings weren't as random as they might seem.

What happens to Sophie in the Joker?

Later, as Arthur kills the TV host live on air, the scene cuts to Sophie, horrified, as she watches the havoc unfold on her TV. These cut scenes confirm what Joker's director Todd Phillips has already alluded to. In an earlier interview, he assured fans that Sophie had, in fact, survived Arthur's wrath.

Does the Joker kill his neighbor Sophie Dumond?

Sophie's fate was left ambiguous in the theatrical cut of Joker, although Phillips has finally confirmed what happened to the single mother from Gotham City. ... Now Todd Phillips has given an unequivocal answer on the subject, saying: He doesn't kill her, definitively.