And when Deinarchus the Corinthian denounced him for this, Cassander flew into a rage and slew the son of Demades as he stood close by his father's side, and then ordered that Demades should be likewise killed.
Edition :
Plutarch Lives VII: Demosthenes and Cicero, Alexander and Caesar, Ed. Jeffrey Henderson, trans. Bernadotte Perrin (The Loeb Classical Library 99), Harvard University Press: Cambridge/MA - London 1967 (first ed. 1919).