1 Kings 16:17-21

Then Omri and all Israel with him went up from Gibbethon and besieged Tirzah.

When Zimri saw that the city was taken, he went into the citadel of the king’s house and burned the king’s house over himself with fire, and died,

because of his sins which he committed, doing evil in the sight of the Lord, walking in the way of Jeroboam, and in his sin which he committed, misleading Israel into sin.

Now as for the rest of the acts of Zimri and his conspiracy which he carried out, are they not written in the Book of the Chronicles of the Kings of Israel?

Then the people of Israel were divided into two parts: half of the people followed Tibni the son of Ginath, to make him king; the other half followed Omri.