I’ve seen people talk about actors and artists that had a terrible time.
My own would be Anne Rice. She wrote Interview with the Vampire after her young daughter died of Leukemia. Then her husband suddenly died of a brain hemorrhage. I suspect her Christian, anti-fanfic phase was a result of mental illness and manipulation from the publishers, although I don’t think she ever apologized.
For what it’s worth, I remember reading somewhere that she gave Sanderson her blessing to finish the series after he gave a very moving eulogy at Jordan’s funeral, so at least she had some say in finishing it up.