A fierce battle raged where Ptolemy was, and while a band of picked Spartans under the command of Evalcus engaged the soldiers who were fighting in front of him, a man of stout arm and swift foot, Oryssus by name, of Aptera in Crete, ran up on one side of the young prince as he was fighting spiritedly, smote him, and laid him low.
Edition :
Plutarch Lives IX: Demetrius and Antony, Pyrrhus and Caius Marius, Ed. Jeffrey Henderson, trans. Bernadotte Perrin (The Loeb Classical Library 101), Harvard University Press: Cambridge/MA - London 1968 (first ed. 1920).
Remark :
perpetrator: According to 30.2, the attackers were part of Areus' army. date: The date is taken from the New Pauly.
http://referenceworks.brillonline.com/entries/brill-s-new-pauly/pyrrhus-e1015710 long-term consequence: Evalcus is slain by Pyrrhus as a revenge for Ptolemaeus' death. This is mentioned in 30.6.