Nemtsov was killed in Moscow at 11:40 pm on Friday, Moscow time (20:40 GMT), after four shots were fired in his back while he was walking with a female companion cross the Zamoskvoretskiy bridge, according to the Russian Interior Ministry.
Thousands of people laid flowers and lit candles on Saturday on a bridge near his murder site.
Some 21,000 mourners attended the funeral march in honor of Nemtsov Sunday.
