After Dion had driven out Dionysius the tyrant, he was at once treacherously slain, and those who had helped him to free Syracuse were divided among themselves. The city, therefore, was continually exchanging one tyrant for another, and owing to a multitude of ills was almost abandoned,
Edition :
Plutarch. Plutarch's Lives. with an English Translation by. Bernadotte Perrin. Cambridge, MA. Harvard University Press. London. William Heinemann Ltd. 1918. 6.
Remark :
perpetrator: The source gives us no information about the perpetrator. motive: Since we do not know anything about the perpetrator it is only an assumption, that Dion was murdered for political reasons. But since he tried to make himself new tyrant, this assumption seems rather plausible.