The 63-year-old was found dead at his California home after a long battle with diabetes.
His sons confirmed the news in an emotional post on his Facebook page.
Furst voiced Dash the loveable walrus in the popular sequel to The Little Mermaid who befriends Ariel's daughter, Melody.
He performed the song "Tip and Dash" alongside Melody and Tip the penguin.
Thoughts are with the family at this tragic time.