Almost certainly Vladimir Lenin.
Mikhail Kudrin, as part of a detail of men under the command of Yakov Yurovsky, is generally believed to have fired the shot that actually killed Tsar Nicholas II. Yurovsky fired the first shot after reading the Tsar his death sentence. Then Kudrin, Petr Ermakov and Pavel Medvedev, at the very least, also shot him even though they had been assigned other family members to shoot.
Lenin had given his anonymous approval after the local Cheka demanded the execution and the Czechoslovak Legion in the civil war was close to capturing Ekaterinberg and the Tsar. Yakov Sverdlov is believed to have set everything up.
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Tsar Nicholas II and his family were executed by the Bolsheviks.
Nicholas II, the last Tsar of Russia, died in the early morning hours of July 17, 1918. He was not killed during the Russian Revolutions in 1917.
Czar Nicholas II and his family were kidnapped and killed on July 17, 1918. The Czar, his wife Tsarina Alexandra and their five children Olga, Tatiana, Maria, Anastasia, and Alexei, along with others that followed them into exile were rounded up and shot.
Tsar Nicholas ll escaped to Germany with his family to escape the civil unrest. He was later murdered by the Bolsheviks on the night of the 16th July 1918.
The last ruling family of Russia was the family ROMANOV, of which the last Tsar is Tsar Nikolai II. The Tsar and most of his family were executed after the Decembrist Bolshevik revolution, led at least ideologically by Vladimir Ilyich Lenin, though rumours abound that his youngest daughter, Anastasiya, had survived the scourge, and subsequently there have been many imposters claiming to be the last Russian princess.