The modernity proposed a task of deconstruction of art, the artists area was expanded to infinity. Everyone could be an artist.     

But if we are all artists, no one is an artist (How to differentiate?). It was not necessary kill the artist, as it had killed the other specifications of art. The artist died of success. Only the artist himself can decide whether he produces is art or not.

So we're not talking about a murder but a suicide. At the time the artist stops feeling such, it’s because he has died, but he has died at their own hands.

Somehow he has never lost control. The artist is eternal.

Duchamp let the art (that said). He, who had established the artist as absolute, as the only maker of art, killed himself because he knew he was immortal.