In the fourth year of Zhenguan, Du Ruhui fell ill and asked Li Shimin to resign. Li Shimin still paid him according to Du Ruhui's previous official position, but Li Shimin was still very worried about Du Ruhui's illness and sent messengers and famous doctors to treat Du Ruhui for many times.

People sent to Du Ruhui Palace can be seen before and after the road. However, Du Ruhui eventually died of illness at the age of 46, and Li Shimin cried so badly that he could not deal with the failure of state affairs for three days. Turn Du Ruhui into Lai Ye.

The story of Du Ruhui's death:

After Du Ruhui's death, Li Shimin wrote a letter to writer Yu Shinan, which said, "Du Ruhui and I have a profound friendship. Today, Du Ruhui died unfortunately. I am sad to think of his previous works. I hope you can understand what I mean and write an inscription for Du Ruhui. "

Later, Fang was given a yellow belt, which made him very sad. He cried and said, "At the beginning, both you and Du Ruhui helped me, but the reward can only be given to you. I heard that ghosts and gods are afraid of yellow silver. I'll take another gold belt and take it to the funeral home in Du Ruhui. "

During the five years of Zhenguan, Li Shimin often dreamed of Du Ruhui because he missed him very much. On the day of Du Ruhui's death, Li Shimin sent officials to Du Ruhui's home to offer condolences to Du Ruhui's wife and children, and the reward at home was the same as before. And appointed one of Du Ruhui's sons as county magistrate.