| This answer is opinion-based.|
Due to lack of canonical information in the franchise, there is no definite answer to this question.
Usually, when a voice actor dies before the conclusion of a film's franchise, they may simply replace them with another voice actor or remove the character entirely from the remaining movies in the franchise. For replacing actors who outgrow their roles is highly unlikely as both the characters and the voice actors are adults and therefore could still presume their roles. If that were the case, depending on the character and how big of a role they play in the movie, their voice actor may simply be replaced or removed entirely from that scene or the movie.