Flavius Josephus, Antiquities of the Jews
William Whiston, A.M., Ed.

[166] But as soon as he was dead (which was when he had lived one hundred and thirty years, having been a righteous, and in every respect a very good man, and was buried in the king's sepulchers at Jerusalem, because he had recovered the kingdom to the family of David) king Jehoash betrayed his [want of] care about God. The principal men of the people were corrupted also together with him, and offended against their duty, and what their constitution determined to be most for their good. Hereupon God was displeased with the change that was made on the king, and on the rest of the people, and sent prophets to testify to them what their actions were, and to bring them to leave off their wickedness; but they had gotten such a strong affection and so violent an inclination to it, that neither could the examples of those that had offered affronts to the laws, and had been so severely punished, they and their entire families, nor could the fear of what the prophets now foretold, bring them to repentance, and turn them back from their course of transgression to their former duty. But the king commanded that Zechariah, the son of the high priest Jehoiada, should be stoned to death in the temple, and forgot the kindnesses he had received from his father; for when God had appointed him to prophesy, he stood in the midst of the multitude, and gave this counsel to them and to the king: That they should act righteously; and foretold to them, that if they would not hearken to his admonitions, they should suffer a heavy punishment. But as Zechariah was ready to die, he appealed to God as a witness of what he suffered for the good counsel he had given them, and how he perished after a most severe and violent manner for the good deeds his father had done to Jehoash.