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He was laregly unknown before he was killed.
And if they wanted to silence him, I think they would have done it in a quiet normal manner while he was in custody in a Russian prison. He could have easily been killed in a prison fight, for example. Or food poisoning could have gotten him.
Why would they wait until he had asylum in Britain and had already published a book laying out all of the scandalous information he learned in the FSB for the public?
His book is now shooting up in the ranks at Amazon.com.
That doesn't sound very "silenced" to me.
If the murder was meant to silence him, then the people who ordered it must be the Keystone Cops.