Ether 9:6

for so great had been the spreading of this wicked and secret society, that it had corrupted the hearts of all the people; therefore Jared was murdered upon his throne, and Akish reigned in his stead.

This wicked secret group had spread so much that it had made all the people evil. So Jared was killed on his throne. Akish became king.

This evil secret society had spread so far that it corrupted everyone’s hearts. So Jared was murdered on his throne, and Akish took his place as king.