Read the article, he has been sick for two weeks before dying. This looks a lot like regular shroom poisoning, he wasn't too young either, and I guess that, at

Read the article, he has been sick for two weeks before dying. This looks a lot like regular shroom poisoning, he wasn't too young either, and I guess that, at >70 years old in Russia, you start to be more vulnerable. I guess that political murder could be an easy explanation, in which case it's really, really subtle, which - huh - isn't really what the FSB is known for ?