In 8:24b-29; 9:14b-16, 21-29 we have an account of the reign of Ahaziah over Judah.
At the age of twenty-two, Ahaziah son of Jehoram began to reign over Judah in the twelfth year of Joram son of Ahab, king of Israel. Ahaziah reigned for one year in Jerusalem (8:24b-26; 9:29).
Ahaziah walked in the way of the house of Ahab and did what was evil in the sight of Jehovah, like the house of Ahab, for he was a son-in-law to the house of Ahab (8:27).
Ahaziah joined Joram the son of Ahab and king of Israel to fight with Hazael king of Syria. Joram was wounded by the Syrians, and Ahaziah went to see him in his sickness (vv. 28-29; 9:14b-16).
Ahaziah joined Jehoram (Joram) to meet Jehu in his rebellion. Ahaziah was fatally wounded by Jehu and was buried in the city of David (vv. 21-28).