Usher's twin sister got terribly sick and thought to be dead and got put into the dungeon. When Rodrick put her down there he realized there was still blush on her face, from blood still flowing throughout her body
When he goes back up to lay in bed he hears someone scratching or something going on down inside of the dungeon where she is.
They heard the lady in the fault and the heavy door open. They started to hear footsteps of someone coming up the stairs.
She came up, fell on top of Rodrick and both died on the spot.