1 Kings 16:17-22

17Then Omri and all the Israelites marched up from Gibbethon and besieged Tirzah. 18When Zimri saw that the city was captured, he entered the citadel of the royal palace and burned it down upon himself. So he died 19because of the sins he had committed, doing evil in the sight of the LORD and following the example of Jeroboam and the sin he had committed and had caused Israel to commit.

20As for the rest of the acts of Zimri and the treason he committed, are they not written in the Book of the Chronicles of the Kings of Israel?

21At that time the people of Israel were divided: Half of the people supported Tibni son of Ginath as king, and half supported Omri. 22But the followers of Omri proved stronger than those of Tibni son of Ginath. So Tibni died and Omri became king.