Police found the note in Cobain's wallet after he killed himself in 1994. It received a lot of media attention last week after CBS News published it, saying it was presumably written by Cobain and that it was sure to stoke questions about what role his marriage played in his death.
Charles R. Cross is a Seattle author who has written several books on Cobain, including the biography "Heavier Than Heaven." He says Love emailed him to say that she wrote the note and that she gave it to Cobain before their wedding in 1991.
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Cross says the couple often wrote each other such sarcastic notes, and the handwriting is Love's.