Zechariah son of Jeroboam II began to rule over Israel in the thirty-eighth year of King Uzziah's reign in Judah. He reigned in Samaria six months.
Zechariah did what was evil in the LORD's sight, as his ancestors had done. He refused to turn from the sins of idolatry that Jeroboam son of Nebat had led Israel to commit.
Then Shallum son of Jabesh conspired against Zechariah, assassinated him in public, and became the next king.
References for 2 Kings 15:10
The rest of the events in Zechariah's reign are recorded in The Book of the History of the Kings of Israel.
So the LORD's message to Jehu came true: "Your descendants will be kings of Israel down to the fourth generation."