Adam Clarke on 2 Chronicles 24:22

The Lord look upon it, and require it - And so he did; for, at the end of that year, the Syrians came against Judah, destroyed all the princes of the people, sent their spoils to Damascus; and Joash, the murderer of the prophet, the son of his benefactor, was himself murdered by his own servants. Here was a most signal display of the Divine retribution.

On the subject of the death of this prophet the reader is requested to refer to the note on Mat 23:34, Mat 23:35.