So Jehu son of Jehoshaphat and grandson of Nimshi formed a conspiracy against King Joram. (Now Joram had been with the army at Ramoth-gilead, defending Israel against the forces of King Hazael of Aram.
But Joram had been wounded in the fighting and had returned to Jezreel to recover from his wounds.) So Jehu told the men with him, "Since you want me to be king, don't let anyone escape to Jezreel to report what we have done."
References for 2 Kings 9:15
Then Jehu got into a chariot and rode to Jezreel to find King Joram, who was lying there wounded. King Ahaziah of Judah was there, too, for he had gone to visit him.
The watchman on the tower of Jezreel saw Jehu and his company approaching, so he shouted to Joram, "I see a company of troops coming!" "Send out a rider to find out if they are coming in peace," King Joram shouted back.
So a rider went out to meet Jehu and said, "The king wants to know whether you are coming in peace." Jehu replied, "What do you know about peace? Get behind me!" The watchman called out to the king, "The rider has met them, but he is not returning."
So the king sent out a second rider. He rode up to them and demanded, "The king wants to know whether you come in peace." Again Jehu answered, "What do you know about peace? Get behind me!"
The watchman exclaimed, "The rider has met them, but he isn't returning either! It must be Jehu son of Nimshi, for he is driving so recklessly."
"Quick! Get my chariot ready!" King Joram commanded.Then King Joram of Israel and King Ahaziah of Judah rode out in their chariots to meet Jehu. They met him at the field that had belonged to Naboth of Jezreel.
King Joram demanded, "Do you come in peace, Jehu?"Jehu replied, "How can there be peace as long as the idolatry and witchcraft of your mother, Jezebel, are all around us?"
Then King Joram reined the chariot horses around and fled, shouting to King Ahaziah, "Treason, Ahaziah!"
Then Jehu drew his bow and shot Joram between the shoulders. The arrow pierced his heart, and he sank down dead in his chariot.
Jehu said to Bidkar, his officer, "Throw him into the field of Naboth of Jezreel. Do you remember when you and I were riding along behind his father, Ahab? The LORD pronounced this message against him:
'I solemnly swear that I will repay him here on Naboth's property, says the LORD, for the murder of Naboth and his sons that I saw yesterday.' So throw him out on Naboth's field, just as the LORD said."
When King Ahaziah of Judah saw what was happening, he fled along the road to Beth-haggan. Jehu rode after him, shouting, "Shoot him, too!" So they shot Ahaziah in his chariot at the Ascent of Gur, near Ibleam. He was able to go on as far as Megiddo, but he died there.
His officials took him by chariot to Jerusalem, where they buried him with his ancestors in the City of David.
Ahaziah's reign over Judah had begun in the eleventh year of King Joram's reign in Israel.