"Drusilla died"

Suetonius tells us that when Julia Drusilla died, Caligula declared a period of mourning for his sister and, ultimately, deified her.

Claudius admits that he has no proof for his contention that Caligula murdered her, and nothing in the ancient sources suggests that he did so. However Suetonius does make the allegation that he had previously raped her, and had had incestuous relations with his other sisters also.