2 Chronicles 13:20 Commentary - English Annotations on the Holy Bible by Matthew Poole
The Lord struck him, i.e. Jeroboam, as appears from the contrary condition of Abijah described in the next verse. Him God might strike, either with vexation and horror of mind; or with some painful and lingering, but incurable, disease, like that of Jehoram, which tormented him two years together, and at last killed him, 2Ch 21:19.
He died; not presently, but a year or two after this time.
Consult other comments:
2 Chronicles 13:20 - Albert Barnes' Notes on the Bible
2 Chronicles 13:20 - Joseph Benson’s Commentary on the Old and New Testaments
2 Chronicles 13:20 - The Cambridge Bible for Schools and Colleges
2 Chronicles 13:20 - Adam Clarke's Commentary and Critical Notes on the Bible
2 Chronicles 13:20 - Companion Bible Notes, Appendices and Graphics
2 Chronicles 13:20 - Ellicott's Commentary for English Readers (Old and New Testaments)
2 Chronicles 13:20 - John Gill's Exposition of the Entire Bible
2 Chronicles 13:20 - Hawker's Poor Man's Commentary (Old and New Testaments)
2 Chronicles 13:20 - English Annotations on the Holy Bible by Matthew Poole
2 Chronicles 13:20 - John Trapp's Complete Commentary (Old and New Testaments)
2 Chronicles 13:20 - The Treasury of Scripture Knowledge
2 Chronicles 13:20 - Whedon's Commentary on the Old and New Testaments
English Annotations on the Holy Bible by Matthew Poole

Matthew Poole (1624–1679) wrote English Annotations on the Holy Bible, completing the chapters as far as Isaiah 58 before his death in 1679. The rest of the Annotations were completed by friends and colleagues among his Nonconformist brethren. The first printing of the completed edition was in 1685, 2 volumes folio, followed by editions in 1688, 1696 (with valuable chapter outlines added by the editors, Samuel Clark and Edward Veale), and the 4th and definitive edition in 1700, the basis of all others.