Sima Shi
The couple became estranged from each other when Xiahou Hui saw that Sima Shi had the intention of usurping the Cao Wei throne. Sima Shi also became suspicious of his wife because she was distantly related to the ruling Cao family, so he allegedly had her poisoned to death in 234. It is just a presumption that Sima Shi was responsible for Xiahou Hui's death. Many rivals of the Sima family have accused Sima Shi of Xiahou Hui's death, leading to scandal and intrigue in the Imperial court.