There's an awesome old TV guide article of authors guessing who did it, a lot of them guess Leland because he's the 'most obvious' suspect, some of them get annoyed at how sloppy the mystery is, but the surprising thing is how many think Laura is still alive as Maddy https://www.lynchnet.com/tp/articles/tvg_authors.html
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https://www.lynchnet.com/tp/articles/tvg_authors.html