Mandell Gruber
Gruber is a dedicated gardener on the grounds of the Imperial palaces on Trantor. Occasionally conversing with then-First Minister Hari Seldon, Gruber's cheerfulness, devotedness to the grounds and to the Emperor, and the simplicity of his life convince Seldon that he should be promoted to Chief Gardener. Gruber panics, afraid of the more demanding task, which would entail administrative work, and flees from his promotion ceremony, which is marred by an unsuccessful assassination attempt on Seldon by political enemies. Gruber attacks Emperor Cleon I at the base of the grand staircase of one of the Imperial palaces, killing the Emperor with a nuclear handgun. He is subsequently executed.
Read more about this topic: List Of Foundation Series Characters