I would recommend mentioning the anime/manga before mentioning the deaths of the respective characters and maybe even placing them in spoiler alerts.
Please make sure you do this from this point on, it might ruin the story for some people otherwise.
Umineko no naku koro ni Chiru
Higurashi no naku koro ni
Death of Enrico Maxwell - Dies alone, impaled,betrayed by his teach
Death of Rip van Winkle- Is tortured while all the other soldiers and The Major watch to show her respect instead of burning her.