He Yan
According to the "Chronicles of the Clans of Wei", Sima Yi assigned He Yan the task of presiding as a judge in the trial of Cao Shuang. He Yan, who wanted to be acquitted, judged Cao Shuang very harshly in order to gain Sima Yi's favour, but Sima Yi added He Yan's name to the list of criminals to be executed at the last moment.