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.
He was buried in Uzza Garden. Soon after that, the people of Judah killed the murderers of Amon, then they made his son Josiah king. Everything else Amon did while he was king is written in The History of the Kings of Judah.