As Roderick predicted, Madeline soon dies. At least we think so. All we know is that Roderick tells the narrator she’s dead, and that she appears to be dead when he looks at her. Of course, because of her catalepsy, she might just look like she’s dead, post-seizure. Keep that in mind. At Roderick’s request, the narrator helps him to entomb her body in one of the vaults underneath the mansion. While they do so, the narrator discovers that the two of them were twins and that they shared some sort of supernatural, probably extrasensory, bond.