The Bolshoi, one of Russia's most prestigious theaters, added that the accident occurred during a change of scenery in the Sedko opera by Russian composer Nikolai Rimsky-Korsakov.
Interfax news agency quoted a source as saying: The artist died, after a piece of decoration fell on him between two scenes.
Sources told the Russian Information Agency and TASS news agency that the fall of a decorative piece was the cause of his death.
Under the title "It Hasn't Happened in 40 Years", the Russian website "Gazeta.ru" said that the 37-year-old Russian artist Yevgeny Kolsh was killed at the beginning of the show in a tragic accident witnessed by everyone on stage.
Eyewitnesses describe that, according to his role, the artist "Kolish" had to put a chair at the top of the middle of the stage, near the back wall, and then take one step to the right; But the actor made a mistake and took one step back; It was under the huge wall that was falling at a speed of 2 meters per second, according to the scene.
The video of the incident, which was broadcast by the site, shows the moment the huge wooden wall descends in the background of the stage, and the group of actors jumping and shouting "Kolish"; But he did not notice because of the noise.. and quickly the heavy wall hit his head, and he fell, soaked in his blood, and died before the ambulance arrived.
"The show was immediately stopped, and they asked the audience to leave," the theater said in comments carried by the Russian Interfax news agency.
Officials from the theater said the massive piece of decoration had shattered Kolsch's skull; Noting that the decorative pieces move according to a specific computer program in time.
Investigators in Moscow said they were investigating the circumstances of the artist's death.