I can think of 2.
1. Cadey Mercury. She had a really short career but she was fine as hell. I think she has like, a heart condition that keeps her from working? Something like that. Unfortunate.
2. Kaho Shibuya. Big fan of hers. Top 5 JAV girls. It seems she got bored from working and wanted to move on to different things. Listened to a podcast with her as a guest and she seems to be doing well; good for her.