Jamieson, Fausset and Brown on 1 Kings 16:19

19. For his sins which he sinned--This violent end was a just retribution for his crimes. "His walking in the ways of Jeroboam" might have been manifested either by the previous course of his life, or by his decrees published on his ascension, when he made a strong effort to gain popularity by announcing his continued support of the calf worship.