Id like to posit that Ash Williams of Evil Dead not only could solve the Kira case, but also divine the powers of the death note. First off, Light wouldn't be able to kill him since Ash doesn't go by his full government name, making Light's attempts fruitless, and also because Ash would absolutely accidentally think the Deathnote is another necronomicon and burn it to ashes, which would piss off Light, revealing himself.