2 Chronicles 24:24-25

24Although the Aramean army came with only a small number of men, Adonai gave over a much larger army into their hands, because they had forsaken Adonai, God of their fathers. So they executed judgment upon Joash.

25When they withdrew from him—for they left him very sick—his own servants plotted against him because of the blood of the sons of Jehoiada the kohen, and assassinated him on his bed. He died and was buried in the city of David—but not in the tombs of the kings.