Which random character death stuck with you?

I'm re-reading DotC and just got past Frog's passing. It's a heartwrenching few pages, going from emotion to emotion. Inspired by Pebble Heart's idea to carry the injured cat on a piece of bark, and heartbroken by his sister begging for him to stay alive when he had probably already passed several moments before... Wind Runner asking if they carried him all the way there, and their reply being that they thought they could save him. Agh! Anyways, Frog was one of Slash's rogues and a relatively underdeveloped character whose death was likely forgotten about by most cats other than his sister, and I don't think I've ever seen the fandom talk about him.

So! Name a death that you think didn't really stick with the fandom, but stuck with you.