As for Ephialtes, who was a terror to the oligarchs and inexorable in exacting accounts from those who wronged the people, and in prosecuting them, his enemies laid plots against him, and had him slain secretly by Aristodicus of Tanagra, as Aristotle says.
Edition :
Plutarch. Plutarch's Lives. with an English Translation by. Bernadotte Perrin. Cambridge, MA. Harvard University Press. London. William Heinemann Ltd. 1916. 3.
Remark :
motive: The enemies of Ephialtes hired Aristodicus of Tanagra to kill him.