But apparently he neglected them and abandoned them to the wrath of the citizens, who were bent on taking vengeance in behalf of Dion, who drove out Dionysius. For Hicetas was the man who took Arete the wife of Dion, and Aristomache his sister, and his son, who was still a boy, and threw them into the sea alive, concerning which things I have written in my Life of Dion.
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: We did not use the details from the vita of Dion. Primarily because the accounts already differ in an important aspect: In Dion, 58.4, the victims are first killed and then thrown into the sea.
Instead we assume he used his mercenaries for this deed. date: The date is taken from the New Pauly.
http://referenceworks.brillonline.com/entries/brill-s-new-pauly/aristomache-e136050 motive: Hicetas probably wanted to get rid of Dion's son, who could have claimed the tyranny for himself. long-term consequence: Years later Hicetas' relatives are killed by the citizens of Syracuse as a revenge.