Short answers, pulled from the story.
Andrei Zhelyabov became the chief organizer of the plan to kill Emperor Alexander II of Russia. He coordinated four bomb-throwers who volunteered for the mission including Ignacy Hryniewiecki and Nikolai Rysakov.
Emperor Alexander II died at 3:30 PM on the afternoon of the 13th of March 1881 after a second bomb exploded near his carriage. The initial attempt occurred earlier that day when Nikolai Rysakov threw a first bomb under the vehicle.
The Church of the Savior on Blood stands opposite the altar at the exact location where the attack on Emperor Alexander II of Russia happened. Construction started in 1883 under Emperor Alexander III and finished in 1907 during the reign of Nicholas II.
The May Laws restricted Jewish rights and increased persecution following the death of Emperor Alexander II of Russia. These laws led to retaliatory attacks against Jewish communities across 166 towns located in the south-western provinces of the Russian Empire.
Six conspirators including Zhelyabov, Perovskaya, Kibalchich, Helfman, Mikhailov, and Rysakov faced trial as State criminals before the Special Tribunal of the Ruling Senate. All six received death sentences by hanging except Ivan Yemelyanov who received life imprisonment instead.