Yes, the similar link was on the post #19. However, we can question Litvinenko since he is a close associate of Berezovskiy--now exiled Tycoon who was suspected as one of the masterminds behind Putin ascendance to Power. I don't think being simply opponent of Chechen war or Putin position as FSB director is enough reason to murder him. More likely that he may knew too much.
Again--we are just speculating--I believe someday truth will be known, but I doubt that we know it soon.
Here is another update on the Trofimov in newsru.com (still only in Russian)
http://www.newsru.com/russia/11apr2005/trofimov.html
Another former FSB official--the former head of FSB in Moscow District Savostjanov thinks that the death of Trofimov could be 85%-90% connected to his current deals and mafia clan warfare for the criminal redistribution of property. However, he does not rule out the Political connections either, mentioning that Trofimov was involved in the investigation of 1996 Yeltsin era election scandal when Yeltsin election workers where found with xerox box full of cash. According to Sevastjanov, Trofimov was also investigating whether Berezovskiy was connected to the murder of Journalist and talk show host Vladislav Listjev. Sevastjanov said that Trofimov wanted to arrest Berezovskiy back then but he was not allowed too. However, Berezovskiy involvement seems highly unlikely--Trofimov left FSB long time ago and Berezovskiy fled Russia fearing Putin reprisals.
Either way, political version can't be ruled out. Plus in Russia, Big Business is very heavily connected to politicians. Of course all over the world Big Businessess play large political role through different means. In Russia, top governmental officials have a lot of arbitrary power over businesses as YUKOS case has demonstrated.
To GarySpFc.
Trofimov was not in intelligence. FSB is not an intelligence agency. Currently Intelligence in Russia is separated from FSB.