Olivia Newton John. I never cry, but I did for ONJ, lots!
Some of my earliest memories are of her on UK weekend chat shows and variety shows (I was around 8 or 9 when she was on TV virtually every weekend), so I kind of "grew up" with her in my teens, following her music etc. She was such a beautiful person, inside and out, lovely personality, did huge amounts of good for charities, nature and animals, including setting up her own cancer wellness centre in Melbourne. She battled cancer for 20 years, whilst continuing to write and record music, continue her concerts, even doing a charity walk along the Great Wall of China with other celebrities to raise money for her wellness centre. No one ever had a bad word about her which is pretty unique in the music industry! She was universally loved.
It was obvious she was coming to the end after news of her third bout of cancer, "retiring" from doing concerts, and then in early 2022, she disappeared completely, no interviews, no webcam chats, etc, so it was clear she was struggling. But it still hit like a freight train when the news of her death was announced. I still well up when I think of her or hear some of my favourite songs of hers.