After leaving Konoha, I dreamed countless times that Itachi stabbed me through the heart with a knife without any expression on his face, as if I was just a stranger with whom I had nothing to do. And I, lying in a pool of blood, kept looking at his back until I no longer had the strength to look any further. He didn't look back, not once, not even for a second.
In the end, the person who ended Sara Uchiha's life was the most important person to her.