His luck finally ran out in Hapyon Detective Agency vs. Carl San Fantastico: The Final Chapter and his real identity was revealed when the duo finally cornered him when he slid on a banana peel after he had stolen and returned Usapyon's suit. Unshelltered told to them that he was once a human, one who was not very confident in himself, and tried to "break free" of his "shell". But before he could, he lost his life in a tragic accident when he when he twisted his ankle upon a misstep and fell down a tall flight of stone stairs.
When Unshelltered gave his story and why he had done everything, Hailey and Usapyon decided to help him actually break out of his shell by smashing him open by using a small rock. They accidentally end up breaking Unshelltered after taking him apart five times, with him getting smaller and smaller with each consecutive peeling until there was nothing left. After a moment of panic, Usapyon and Hailey scooped up Unshelltered's shell fragments into trash bags and placed them outside for garbagemen to deal with them.