2 Kings 23:29-30

29While Josiah was king, Pharaoh Necho, the king of Egypt, took his army up to the River Euphrates. He went there to help the king of Assyria. King Josiah took his army to fight against Pharaoh Necho. But Necho killed Josiah in a battle at Megiddo.

30Josiah's servants put his dead body in a chariot. They took it from Megiddo to Jerusalem. They buried him in his own grave. Then the people of Judah poured olive oil on the head of Josiah's son Jehoahaz. So he became king after his father.