who has been murdered, and why is victor accused of the murder?

For two months, Victor lies in a delirium of fever and confusion. He cries out that he is a murderer, and begs his attendants to aid him in apprehending the monster. When Victor finally emerges from his delirium, he finds that a grim-faced old woman has been attending upon his sickbed. She tells him that he will be sorely punished for the murder of Henry.