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In 345, because Li Shi had no sons, his younger brother Li Guang (李廣) requested to be crown prince. Li Shi disagreed. His advisors Ma Dang (馬當) and Xie Siming (解思明) tried to persuade him otherwise—arguing that Li Shi, in addition to having no sons, also had few brothers, and therefore needed to have Li Guang's support. Li Shi suspected the two of them—both of whom had served his father faithfully—of plotting with Li Guang, and so arrested them and executed them, along with their clans. He also demoted Li Guang to the title of Marquess of Linqiong, and Li Guang committed suicide. The people greatly mourned for Ma and Xie's deaths.