Passage 6.12.4
τοῦ δέ οἱ βίου συνέβη γενέσθαι τὴν τελευτὴν ὑπὸ Δεινομένους, γένος μὲν Συρακουσίου, δυσμενέστατα δὲ ἀνδρὸς ἐς τυραννίδα ἔχοντος, ὃς καὶ ὕστερον τούτων Ἱπποκράτει τῷ ἀδελφῷ τῷ Ἐπικύδους ἐξ Ἐρβησσοῦ παρεληλυθότι ἄρτι ἐς Συρακούσας καὶ ἐς τὸ πλῆθος ποιεῖσθαι λόγους ἀρχομένῳ ἐπέδραμεν ὡς ἀποκτενῶν τὸν Ἱπποκράτην· τοῦ δέ οἱ ἀντιστάντος, κρατήσαντες τῶν δορυφόρων ἄλλοι διαφθείρουσι τὸν Δεινομένην. τοὺς ἀνδριάντας δὲ τοῦ Ἱέρωνος ἐν Ὀλυμπίᾳ, ἐφʼ ἵππου τὸν ἕτερον, τὸν δὲ αὐτῶν πεζόν, ἀνέθεσαν μὲν τοῦ Ἱέρωνος οἱ παῖδες, ἐποίησε δὲ Μίκων Νικηράτου Συρακούσιος.
The end of his life occurred at the hands of Deinomenes, a man of Syracusan descent who was strongly hostile toward tyranny, and who afterwards made an attack on Hippocrates, the brother of Epicydes, when Hippocrates had just come from Erbessus into Syracuse and had begun to deliver speeches to the populace; Deinomenes set upon him intending to kill Hippocrates, but the latter resisted, and while they engaged, others overpowered Deinomenes' bodyguards and killed him. The statues of Hieron at Olympia, one of which shows him mounted on horseback and the other standing on foot, were dedicated by his sons; they were made by Micon, son of Niceratus, a Syracusan.