Did katherina die??? 5x10

No she didnt die yet, in the プレビュー to the 次 episode it says she is still alive but she is dying. So there are a few もっと見る scenes with her for sure. Hope this helped.

I think Katherine had a ハート, 心 attack but no she doesn't die it is in the promo for 5x11 in January. She is dying though how she is going to die is still unknown.