He was killed by Duke Jing of Jin, because Duke Jing thought Tu'an Gu was too powerful and he was afraid that Tu'an Gu would threaten his rule, so he killed Tu'an Gu.
First of all, what was Tu'an Gu like in history?
Speaking of it, everyone will definitely think of the story of orphan Zhao.
Tu'an Gu killed Zhao Dun mainly to avenge Jin Linggong, because Zhao Dun had killed Jin Linggong.
Although Jin Linggong deserved it, it was wrong for Zhao Dun to kill the monarch as a courtier, so it is understandable for Tu'an Gu to avenge the monarch.
Second, how did Tu'an Gu die?
Speaking of Tu'an Gu's death, it still has something to do with Zhao Dun. After Tu'an Gu urged Duke Jing of Jin to kill Zhao Dun, he began to monopolize power in North Korea.
15 years later, Duke Jing of Jin suddenly fell ill and asked someone to read his divination.
The result of divination was also beyond Kim's expectation. The fortune teller told Jin that he was ill mainly because he killed a large family who had worked for Jin.
After learning the result of divination, Han Zeng, the servant of Duke Jing of Jin, immediately went to analyze Zhao Dun's family affairs for Duke Jing of Jin, saying that Zhao Dun's son was still alive.
After hearing these analyses, Duke Jing of Jin ordered the killing of all the people in Tu'an Gu.
Third, what is Tu'an Gu's reputation in history?
Although Tu'an Gu is a famous brutal official in the history of China, if we put aside history and carefully analyze Tu'an Gu's actions, he is actually not a heinous person.
Tu'an Gu killed Zhao Dun first, because Zhao Dun was at fault first. As a courtier, Zhao Dun killed his own monarch. Such behavior belongs to rebellion in any dynasty and any generation.
That's why Tu'an Gu wanted to kill Zhao Dun. However, after Duke Jing of Jin thought that Tu'an Gu was useless to him, he tried his best to destroy all the people in Tu'an Gu.
The practice of Duke Jing of Jin chilled the hearts of the nobles of the State of Jin, so the nobles of the State of Jin later destroyed the imperial clan of the State of Jin.
Summary: Tu'an Gu did exist in history. He was a famous minister in Duke Jing of Jin Dynasty.
He was killed by Duke Jing of Jin because he once killed the Zhao Dun family.
Later, Duke Jing of Jin thought that Tu'an Gu's existence posed a threat to himself, so he wiped out all the people.