No, they never were killed, some say that after Odysseus left them they drowned themselves for letting a ship of men by them unmoved. This isn't likely, as the Argonauts fled them previously, and they were said to have murdered a son of Odysseus, Telemachos.
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Hermes tricked the sirens into eating themself by painting them to look like humans why they were sleeping.
They were hideous! Only their singing was pretty.
Symbol of the dangers of the sea to the unwary sailor.
Bellaphron killed the chimera
Sirens were deities of Greek Mythology - first written of by Homer in around 850 BC or 12th Century BC.