Sergei Yushenkov, Member of Parlament ==
Yshenkov got killed by his collegue of his party. They got into despute about donated money.
Artyom Borovik, Investigative Journalist, Reporter, Writer, Publisher (Technically it was air crash, but many suspect a foul play). ===
Borovik case wasn't foul play. His plane got into strong wind gust on takeoff and plane wings got ice covered before takeoff. It was fault of pilots.
Galina Starovoitova, Activist, former MP==
Staravoitova carried about 1 mln dollars of cash which she got for her reelection on her when got killed. Her killers hunted that money, they alredy got caught and now there are court hearing goes.
You read papers and internet:).
Trofimov was never the head of russian intellegence. He was once the head of Moscow regional office of FSB (the analog of FBI). It is like regional representative of counter intellegence.
Since that he wasn't collegue of Putin. Putin was integellence(like CIA). Trofimov was like of FBI.
But Trofimov got fired in 1997. Since he worked as commersant in building business in Moscow. It is according papers again.
I think it is big money means Mafia who had killed Trofimov.
Sorry--not everything you find on the Internet is neccessarily trustworthy. The "pilot fault" in Borovik Plane crash is the official Russian government version, and I have every reason to view the official Russian government version with suspicion.
"But Trofimov got fired in 1997".
Yes he was fired in 1997 when he was involved in the investigation of this famous Summer 1996 accident during Yeltsin re-election campaign when two Yeltsin campaign election workers were found with a xerox box full of cash (something like $500,000).
Here is the link in gazeta.ru (In Russian only).
http://www.gazeta.ru/2005/04/11/oa_154255.shtml