The content of this article is derived from notes and drafts of the Harry Potter books/films/games that were cut before being released. As such, the contents of the article may or may not be considered canonical.
He lived in the Victorian era, and died in the doorway of the Great Hall at Hogwarts Castle after ingesting poisonous berries. After his death, he returned as a ghost to haunt the Castle, sometimes stopping people from getting into the Great Hall out of spite.
Behind the scenes
Edmund Grubb was one of the original ghosts created by J. K. Rowling but did not survive final edits; she "rather regrets" not using his character.