Ah yes, my mistake. Khodorkovsky was the name I should have dropped in my attempt to deflect blame like the good Kremlin puppet I am.
Sergei Sokolov stated that Berezovsky was probably murdered by western security services because he was about to expose a plot to topple President Putin.
I seem to recall an attempt on Berezovsky's son-in-law a while back too.
This is the kind of intrigue you'd normally expect in a John Le Carré novel.