In the story, Itachi betrays his clan, completely destroying everyone except his younger brother, Sasuke. A former member of the Utikh family was declared a criminal. And Sasuke promised that he would find and punish the killer. When former relatives meet in a duel, no one knows what the outcome of the battle will be.
Itachi is older, more experienced. But his body has long been eroded by a secret illness. In the battle of the brothers, the older one seems to have the upper hand. But suddenly the enemy starts coughing up blood. In medicine, this is considered a sign of a serious disease-tuberculosis, destruction of lung tissue.
In a duel, Itachi weakens before our eyes. He says something to Sasuke. But then he falls dead. The character's demise occurs in episode 138 (season 2).
Itachi belongs to the Uchiha family. From infancy, he was predicted to be famous for nijutsu. So strong were the boy's natural talents. But at the age of four, he goes through the crucible of another Shinobi war. This completely changes the guy's worldview. So he becomes a pacifist.
However, at the age of seven, the guy finishes the academy, becoming the best among the ninja students there. In the future, the teenager continued to improve his skills. He respected the head of the clan, his father. I didn't spend much time with my younger brother, Sasuke.
He was both jealous of his older brother and secretly dreamed of beating him in the martial arts field once. Gradually, Itachi grew closer to Sasuke. And even because of him, I didn't show up for an important task for the entire clan. Relations between the brothers were strained after the elder was implicated in the murder of the entire clan, including his parents.
But Sasuke doesn't know the whole truth. Why did big brother do this? We'll find out later. When Itachi reveals what motivated him to kill.