There is no episode in which Boa Hancock dies. In fact, she is currently alive in the One Piece series. While there are some fan theories about how she might die, there is no official information or confirmation about her death. In the series, Boa Hancock is a well-known character who is the Pirate Empress and the leader of the all-female crew, the Kuja pirates. She has a specific relationship with Luffy and has played a significant role in the series.