2 Chronicles 22:9

Compare the marginal reference. Ahaziah after remaining a while at Megiddo, removed to Samaria, where his wounds could be better cared for and concealment might be easier; Jehu’s emissaries discovered him there; they took him to Jehu, who happened at the time to be at Megiddo; and then and there Jehu put him to death. The narrative here is therefore supplementary to that of 2 Kings, and finds its proper place between the clause,” He fled to Megiddo,” and the words “and died there.”

And when they had slain him, they buried him - Jehu’s emissaries killed him but allowed his servants to bury him (see 2 Kings 9:28).

No power ... - As Ahaziah was but twenty-three at his death (2 Chronicles 22:2 note), he had no grown-up son to take the crown.