Nemtsov has long ceased to be a figure of any importance and was hardly noticed in politics.
If that were the case, then what's your reasoning to why he was murdered? And if he were insignificant, why is this news making the rounds?
Ask the question of who benefits from his death, and who makes the most noise.
I already posted the following link, which is the best description of the reasons and background for his murder that I've seen so far:
https://futuristrendcast.wordpress.com/2015/02/28/ladas-investigation-who-benefits-from-the-death-of-the-russian-oppositioner-boris-nemtsov/As for news making the rounds. It's just like with MH-17 failed false flag. Once it becomes apparent that this murder cannot achieve the goal of creating another "Ukraine" out of Russia - creating instability there - then his death will disappear from the Western MSM front pages.
By the way, saying that Nemcov was a leading critic, is about as correct as saying that Arnold Schwarzenegger is the most prominent politician of the USA.