Why did Cao Rui kill Queen Mother Guo?

Cao Rui wanted to kill Queen Guo because he thought that Queen Guo had killed his mother. After Cao Rui acceded to the throne, he began to be quite filial to his adoptive mother Guo, but Cao Rui was worried about her mother's death at an early age, so he had to find out. Cao Rui gradually became decadent in his later period, singing and dancing all day long, and almost all of them paid homage to his mother Zhen Shi. Queen Guo tried to persuade Cao Rui, but she was questioned. Finally, Cao Rui put all the blame on Guo.

Cao Rui hated Guo even more, and couldn't find any evidence. He cried and asked Guo's mother how she died many times, but Guo was speechless every time. Cao Rui analyzed that after Zhen Shiyin's death, the Guo family was the biggest beneficiary, but the Guo family was extremely angry because they could not clear their grievances, so Cao Rui avenged his mother.

After Cao Rui killed Queen Mother Guo, he covered up the facts.

Queen Guo is the empress dowager of Notre Dame Cao Cao. If Cao Rui kills her, she will be accused of "killing her mother", which is a fatal threat to the legitimacy of the Cao Rui regime. In order to cover up the crime of "killing mother", Cao Rui claimed that Queen Mother Guo died of illness, and then stuffed it with chaff and buried it hastily.

Cao Rui buried the Queen Mother Guo, and in order to cover up the charges of killing her mother, she gave a posthumous gift to the Queen Mother Guo's family who died alive. While honoring the people of Empress Dowager Guo, Cao Rui pretended to be heartbroken because of her mother's death and refused to go to court. Ministers advised him three times before Cao Cao went to court.