Via Mashable:

Tens of thousands of people turned out in central Moscow on Sunday to march in honor of opposition leader and democratic crusader Boris Nemtsov, who was killed by an unknown assailant Friday night.

He was strolling across a bridge over the Moskva River only a few hundred meters from the Kremlin, when shots rang out from the open window of a white car, and four bullets pierced Nemtsov’s back.

On Sunday, he was remembered by young and old, elite and ordinary, across Russia. In Moscow, some 50,000 people, according to organizers, memorialized him in poems and placards deeming him a hero.

“I am Nemtsov”:
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More pictures here.