2 Kings 15:30
conspired against <07194> [A.M. 3265. B.C. 739. made.]
assassinated <05221> [and smote.]
king <04427> [reigned.]
"After an anarchy for some years."
twentieth <06242> [in the twentieth.]
"In the fourth year of Ahaz, in the twentieth year after Jotham had begun to reign."--Usher.
2 Kings 15:25
Pekah <06492> [A.M. 3245. B.C. 759. Pekah.]
officer <07991> [a captain.]
conspired <07194> [conspired.]
Argob <0709> [with Argob.]
From the contstruction of the Hebrew text, it would appear that Argob and Arieh were slain with the king, and that the fifty Gileadites were conspirators with Pekah.
