Li Si
The eldest son Fusu was supposed to be elected as the next emperor. However, Premier Li Si and the Chief Eunuch Zhao Gao conspired to kill Fusu in order to get rid of Fusu's favourite General Meng Tian, who was their court rival. They were afraid that if Fusu was enthroned, they would lose their power. Li Si and Zhao Gao forged a fake edict by Qin Shi Huang ordering both Fusu and General Meng to commit suicide. Their plan worked, and the younger son Huhai acceded the throne to become the Second Emperor later known as Qin Er Shi (秦二世). Although, recent findings of bamboo strips dating from the time of the intrigue note that Huhai wouldn't wait and killed his brother. This would indicate that the fake edict, in the case of Fusu, was an imperial cover story.