Judah's King Amaziah son of Joash lived 15 years after the death of Israel's King Jehoash son of Jehoahaz.
References for 2 Chronicles 25:25
The rest of the events of Amaziah's [reign], from beginning to end, are written about in the Book of the Kings of Judah and Israel.
From the time Amaziah turned from following the Lord, a conspiracy was formed against him in Jerusalem, and he fled to Lachish. However, [men] were sent after him to Lachish, and they put him to death there.
They carried him back on horses and buried him with his fathers in the city of Judah.
References for 2 Chronicles 25:28