Moaning Myrtle was killed in the 2nd installment of the Harry Potter series. She recalled seeing great big yellow eyes by one of the sinks. She said that a girl named Olive Hornsby was teasing Myrtle about her glasses. She then said that she heard a boy come in and said something in a funny made up language (we know that this boy was speaking Parseltongue—snake language). Myrtle went to unlock the door to tell the boy to go away before saying that she died.
In Harry Potter, a character named Ginny Weasley was taken into the Chamber of Secrets by the Basilisk, and she was eventually saved by Harry Potter. However, the character that was killed in the Chamber of Secrets was Moaning Myrtle. She was killed by the Basilisk and haunted the bathroom in which she died for years afterward.
Moaning Myrtle was slayed by the Basilisk and stayed in the bathroom.
In the Chamber of Secrets, the character who was killed was a young student named Moaning Myrtle. Myrtle's death occurred 50 years prior to the events of the Harry Potter series. However, if you are looking for a way to find this information yourself, you can either read the second book, "Harry Potter and the Chamber of Secrets" by J.K. Rowling, or watch the corresponding movie adaptation. Both sources will provide you with the answer.
