王守澄
By this point, Emperor Xianzong, whose illness was said to be due to alchemists' pills that were designed to achieve immortality. Xianzong's temper and rage had become uncontrolled, causing widespread fear among the eunuchs. In spring 820, he died suddenly—and it was believed that he was assassinated by the eunuch Chen Hongzhi (), but the eunuch suppressed an investigation into the matter, announcing that Emperor Xianzong had died from the pills' complications. In the aftermaths, the eunuchs Liang Shouqian (), Ma Jintan (), Liu Chengjie (), Wei Yuansu (), and Wang Shoucheng, who supported Li Heng, killed Tutu and Li Yun, allowing Li Heng to take the throne (as Emperor Muzong). (There were suspicions by some, including by Li Heng's younger brother Li Yi, who would later become Emperor Xuānzong, that Li Heng and his mother Consort Guo were involved in Emperor Xianzong's assassination.)