Bowie, Prince and Keith Flint. I think because I was able to see them all Live, the loss of their talents and total showmanship hit quite hard - they were so very different as artists, but all exuded something quite special that stars these days don't seem to have. I expect if I had been older when he died, I would feel the same about Freddie Mercury.
Kirsti McColl still saddens me, the way she died more than anything. So senseless and so quick, her poor family living with that.
More recently the killing of Charlie Kirk. I think because it was so public, I still find myself mulling over it and being shocked that it happened. I don't know that he was a huge loss to the world - obviously to his family and his fans he was - but again I can't help thinking about such a senseless death.