Jehu kills Joram and Ahaziah
Jehu killed Jehoram at Jezreel. Ahaziah fled toward Beth-haggan, and Jehu killed him as well.
Key passages
2 Ki 9:14–29

So Jehu the son of Jehoshaphat the son of Nimshi conspired against Joram. Now Joram was keeping guard in Ramoth-Gilead, he and all of Israel, because of the threat of Hazael king of Aram. But Joram the king had returned to heal in Jezreel from the wounds that the Arameans had inflicted on him …

2 Ch 22:7

But the downfall of Ahaziah was from God, and intended to come to Joram. And when he came, he went out with Jehoram to Jehu the son of Nimshi, whom Yahweh had anointed to destroy the house of Ahab.

2 Ch 22:9

And he searched for Ahaziah and captured him. And he was hiding in Samaria. And they brought him to Jehu and put him to death. And they buried him, for they said, “He is the descendant of Jehoshaphat, who sought Yahweh with his whole heart.” And the house of Ahab had no one to exercise power over …