Already notorious for his many affairs with aristocratic women (and later rumoured to have had an affair with the Tsarina as well), Rasputin came to the attention to Tsar Nicholas and his wife when he successfully healed the favourite hunting dog of a member of the royal family.
Tsarina Alexandra, said to have believed heavily in faith healing and spirituality, became particularly interested in his reputation because their only son (and heir) Alexis suffered from haemophilia, a painful malady which doctors had warned would end in death at a young age. After being summoned to the royal court, Rasputin is said to have helped the boy recover by and the laying of hands. Rasputin’s influence over the royal family apparently stemmed from this seemingly miraculous act.
An outspoken opponent of war, Rasputin voiced his condemnation of Russia’s involvement in WWI at every opportunity--in the restaurants, bars, and halls, and in the bedrooms of the aristocratic women he bedded.
The poor decisions made by the Tsar during the time of Rasputin's influence, coupled with the contempt his very presence in the Royal Palace brought the Russian people, probably contributed significantly to the fall of the Tsar in the final days of the dynasty.
The Russian people had apparently lost confidence in their ruler at a time of grave crisis; the war was going badly, and there were severe shortages of food and supplies at home. As public confidence waned, the revolutionary ideas that had already been fermenting in Russia for the prior fifty years began to bubble to the surface.
Seeking to distance the Russian government from Rasputin and the hold he had on the royal family, Russian Minister of War Alexander Guchkov charged him with being a member of the illegal, orgiastic sect, the khlysty. The Tsar, however, referred to Rasputin as "our friend" and a "holy man,” and refused to take any steps to alienate the healer. Taking matters into their own hands, on December 16, 1916, a group of nobles led by Prince Felix Yusupov, Grand Duke Dmitri Pavlovich, and the right-wing politician Vladimir Purishkevich, lured Rasputin to the Yusupovs' Moika by intimating that Yusupov's wife, Princess Irina, would be present and wanted to meet him. (In actuality, she was away in the Crimea.)
Royal Palace
Once there, the conspirators led Rasputin down to the cellar where they served him cakes and red wine laced with a massive amount of cyanide. According to first-hand reports, however, Rasputin was unaffected although Vasily Maklakov had supplied “enough poison to kill five men.” Two hours later, although Rasputin appeared tired, he was still very much alive.
In desperation, Prince Felix Yusupov then got his revolver and shot Rasputin once in the heart, after which Rasputin appeared lifeless and Yusupov could find no pulse. But then suddenly, first one eye opened, and then the other. Rasputin leaped to his feet and attacked Yusupov, attempting to strangle him, all the while reportedly foaming at the mouth.
Fleeing the palace on his own power, Rasputin was followed into the courtyard, saying that he was going to tell the Tsarina, at which time Purishkevich shot him in the back. When Rasputin stopped, Purishkevich fired again, sending him to the ground. He then kicked Rasputin's in the temple, leaving a severe wound.
When the was brought back into the palace, Yusupov is said to have lost control, repeatedly beating Rasputin on the head with a blackjack. (Some accounts say his killers even sexually mutilated him, severing his penis.) Binding his body and wrapping him in a carpet, they threw him into the icy Neva River where the body was eventually discovered about seven hundred and fifty feet downstream where it had travelled under the ice.
The autopsy revealed that Rasputin had water in his lungs, meaning he was still alive when he was thrown into the water. A photograph from the autopsy suggests that he was still trying to free himself from his bonds.
Subsequently, Tsaritsa Alexandra buried Rasputin's body on the grounds of Tsarskoye Selo. A short time later, the Russian Revolution led to ending the lives of Nicholas and the royal family.
While many follow the life and death of Rasputin, one of the most poignant is evidence that he apparently had premonitions of his own death, as well as the fall of Russia. In a letter written by Rasputin, he writes, “My hour will soon come. I have no fear but you must know that the hour will be bitter. I will suffer a great martyrdom. I will forgive my torturers and will inherit the kingdom." In a reported conversation taking place on the day of his death, he told an acquaintance (said to have been the Tsarina) "Little mother, I feel my end is near. They'll kill me and then the throne won't last 3 months."
After the February Revolution, a group of workers from Saint Petersburg uncovered Rasputin's remains, carried them into the nearby woods, and burned them. As the body was burning, Rasputin is said to have sat up in the fire, his attempts to stand thoroughly horrifying several onlookers. This final happenstance only further fuelled the and mysteries surrounding Rasputin which continue to this day.
References:
Rasputin and the Fall of the Romanovs, Colin Wilson
http://www.historywiz.com/historymakers/rasputin.htm
Images via wikipedia.org unless credited otherwise (with my thanks