The Shu general Zhang Ni had noted that Fei Yi tended to be too good-natured and overly trusting of the people around him. He once warned Fei Yi: "In the past, Cen Peng commanded troops and Lai Xi wielded the staff of imperial authority; both of them were assassinated. In the present-day, you, General, occupy a position of great importance and power so you should learn from these historical examples and be more vigilant." As Zhang Ni foresaw, Fei Yi indeed met his end at the hands of the assassin Guo Xiu.