“The rest of the deeds of King Hezekiah, and all his power, and how he made the pool and the conduit and brought water into the city, are they not written in the Book of the Annals of the Kings of Judah? King Hezekiah slept with his ancestors. His son Manasseh succeeded him.”
As per usual, if you want to know more, look up the lost “Book of the Annals of the Kings of Judah.” King Hezekiah brought water to Jerusalem with a pool and canal. He then died. There is no mention of his burial. His son King Manasseh took over after his death.