Since I'm not familiar with the so - called 'Octopus Murders' true story, it could be a variety of things. If it is real, it might involve a criminal who had an obsession with octopuses and committed murders in relation to that. Or maybe it was a series of murders that took place near an octopus - farming area or a place where octopuses are a significant part of the local ecosystem. However, this is all just guesswork without more context.
I haven't heard of a particular 'Octopus Murders' true story. Maybe it's a story that is not very well - known globally. It could be about murders somehow related to octopuses, perhaps involving a location where octopuses are abundant or a strange connection to octopus - related activities, but without more info, it's just speculation.