Jehoram of Israel

Remember when God killed Ahab for not killing a captured king? You might have thought that that would be the end of it. But no. God still had Ahab's family to kill. It was sort of his way of paying it forward.
The story is a bit complicated, but it starts with Elisha, who called one of "the children of the prophets" and told him to "gird his loins," get some oil, and go anoint Jehu as king of Israel. (You know you're in for some big-time prophet action when Elisha tells you to grab some oil and gird your loins.)

Elisha the prophet called one of the children of the prophets, and said unto him, Gird up thy loins, and take this box of oil ... And when thou comest thither, look out there Jehu ... and ... take the box of oil, and pour it on his head, and say, Thus saith the LORD, I have anointed thee king over Israel. 2 Kings 9:1-3

So that's what that son of a prophet did. He girded his loins and made Jehu king.
Then he told the new king that God had a job for him.

Thus saith the LORD God ... thou shalt smite the house of Ahab thy master, that I may avenge the blood of my servants the prophets, and the blood of all the servants of the LORD, at the hand of Jezebel. 2 Kings 9:6-7

Just in case it wasn't clear, the son of the prophet elaborated a bit. God wanted Jehu to kill everyone in Ahab's family, especially those that had ever "pissed against a wall."

For the whole house of Ahab shall perish: and I will cut off from Ahab him that pisseth against the wall. 2 Kings 9:8

He reminded Jehu of the last two families that God had executed: Jeroboam's and Baasha's. He wanted Jehu to go and do likewise to Ahab's family.

I will make the house of Ahab like the house of Jeroboam ... and Baasha. 2 Kings 9:9

But there was one person that God wanted more than just dead. Ahab's wife, Jezebel, was to be not just killed, but fed to the dogs, so that there would be nothing left of her body to bury.

And the dogs shall eat Jezebel in the portion of Jezreel, and there shall be none to bury her. 2 Kings 9:10

And that was the end of the message from God.
(As you may have noticed by now, God has a one-track mind.)
So Jehu took off in his chariot to get started on God's killings. When people saw him coming, they'd say, "That must be Jehu because he's driving like crazy." (Jehu is the patron saint of reckless drivers.)

And the watchman told, saying, He came even unto them, and cometh not again: and the driving is like the driving of Jehu the son of Nimshi; for he driveth furiously. 2 Kings 9:20

It wasn't long before Jehu found God's first victim: Ahab's son, Jehoram -- a wall-pisser if there ever was one!
So Jehu did what God told him to do. He shot him right through the heart and threw his dead body in the field of Naboth, "according to the word of the Lord."

Jehu drew a bow with his full strength, and smote Jehoram between his arms, and the arrow went out at his heart ... Then said Jehu to Bidkar his captain ... cast him into the plat of ground, according to the word of the LORD. 2 Kings 9:24-26

And so died the first wall-pisser in Ahab's family.
Then Jehu got back in his chariot and drove off furiously to find the rest.

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God's next killing: Jezebel