2 Chronicles 24:23-25

23So it happened in the spring of the year that the army of Syria came up against him; and they came to Judah and Jerusalem, and destroyed all the leaders of the people from among the people, and sent all their spoil to the king of Damascus.

24For the army of the Syrians came with a small company of men; but the Lord delivered a very great army into their hand, because they had forsaken the Lord God of their fathers. So they executed judgment against Joash.

25And when they had withdrawn from him (for they left him severely wounded), his own servants conspired against him because of the blood of the sons of Jehoiada the priest, and killed him on his bed. So he died. And they buried him in the City of David, but they did not bury him in the tombs of the kings.