Sejanus remained powerful until his sudden downfall and summary execution in October 31, the exact reasons for which remain unclear. On 26 October 31, just eight days after his death, his wife Apicata committed suicide. According to Cassius Dio, she left a message for the emperor: his son had been murdered by his wife Livilla and her lover, Sejanus. The story should be read with caution. Levick says that Sejanus must have murdered Drusus in self-defense because only Tiberius stood between the Praetorian Prefect and the end of his career at the hands of Drusus. Furthermore, he says it is even less likely that Livilla would have been complicit in the destruction of her family, the key to her children's future. Levick dismisses the accusation of Apicata as the revenge of a woman whose husband left her for another.