20 And his servants arose, and made a conspiracy, and slew Joash in the house  of Millo, which goeth down to Silla.
20 His officials conspired against him and assassinated him at Beth Millo, on the road down to Silla.
20 His servants arose and made a conspiracy and struck down Joash in the house of Millo, on the way that goes down to Silla.
20 At the last his palace staff formed a conspiracy and assassinated Joash as he was strolling along the ramp of the fortified outside city wall.
20 And his servants arose and formed a conspiracy, and killed Joash in the house of the Millo, which goes down to Silla.
20 Joash's officers plotted against him and assassinated him at Beth-millo on the road to Silla.
Matthew Henry's Commentary on 2 Kings 12:20
Commentary on 2 Kings 12:17-21
(Read 2 Kings 12:17-21)
Let us review the character of Jehoash, and consider what we may learn from it. When we see what a sad conclusion there was to so promising a beginning, it ought to make us seek into our spiritual declinings. If we know any thing of Christ as the foundation of our faith and hope, let us desire to know nothing but Christ. May the work of the blessed Spirit on our souls be manifest; may we see, feel, and be earnest, in seeking after Jesus in all his fulness, suitableness, and grace, that our souls may be brought over from dead works to serve the living and true God.