In February 2015 Russian politician Boris Nemtsov—a fierce critic of Vladimir Putin—was shot dead on a bridge in the shadow of the Kremlin.

Five men were convicted for his murder, but urgent questions remained: Who ordered the killing…and why?

Now, a new film from Bellingcat, The Insider, and BBC Eye Investigations reveals evidence that, in the year running up to the shooting, Boris Nemtsov was being shadowed by a government agent linked to a secret assassination squad.

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