2 Kings 1:16-20

Then he said to him, “This is what the Lord says: ‘Since you have sent messengers to inquire of Baal-zebub, the god of Ekron—is it because there is no God in Israel to inquire of His word? Therefore you will not get down from the bed upon which you have lain, but you shall certainly die.’ ” Jehoram Reigns over Israel

So Ahaziah died in accordance with the word of the Lord which Elijah had spoken. And since he had no son, Jehoram became king in his place in the second year of Jehoram the son of Jehoshaphat, king of Judah.

Now as for the rest of the acts of Ahaziah which he did, are they not written in the Book of the Chronicles of the Kings of Israel?