This information was originally shared by the former Ash Ketchum voice actor Veronica Taylor and more of the voice acting and Pokémon community have now joined in to pay their respects. Here are the many messages on social media about this "extraordinary talent" including an acknowledgement from the official Pokémon account:
As we've already noted, a memorial will be planned for Lillis at a later date. Apart from playing roles like Misty and Jessie, she was also credited on the Pokémon movies, Berserk, Hunter x Hunter and the Super Smash Bros. series (Jigglypuff).
Once again, our thoughts go out to Rachael's friends and family during this difficult time.
