Everything else Hezekiah did while he was king, including how he made the upper pool and tunnel to bring water into Jerusalem, is written in The History of the Kings of Judah.
The LORD said, “I will desert the people of Judah, just as I deserted the people of Israel. I will reject Jerusalem, even though I chose it to be mine. And I will abandon this temple built to honour me.”
During Josiah's rule, King Neco of Egypt led his army north to the River Euphrates to help the king of Assyria. Josiah led his troops north to fight Neco, but when they met in battle at Megiddo, Josiah was killed.