@JSharp1436
I'm pretty sure it was just some random attache who had no connection to the CIA who wasn't considered important enough to have any proper protection. He was killed because he was low hanging fruit for the Russians. Russians are at war with the world and are increasingly desperate, for them there is no target too low. If they consider you their enemy and the only thing they can get to is your cat, they will kill your cat.
@GreenFire@JSharp1436
Given the number of assassinations committed by the Russian intelligence services all over the world in the last decade or so the chances for a natural cause of death here are pretty low. And if you consider how slow US State Department acted in regard to Havana syndrome the information about what actually happened might come out years later if at all.