Because of how much Emperor Taiwu missed Crown Prince Huang, Zong Ai became anxious, and in spring 452 he assassinated Emperor Taiwu. Initially, a number of officials were going to make Emperor Taiwu's son Tuoba Han (拓拔翰) the Prince of Dongping emperor, but Zong also had bad relations with Tuoba Han, and so falsely issued orders in the name of Empress Helian to make another son of Emperor Taiwu's, Tuoba Yu the Prince of Nan'an, emperor, while putting Tuoba Han to death.