Alma 47:18

"And it came to pass that Amalickiah caused that one of his servants should administer poison by degrees to Lehonti, that he died."

Amalickiah works through fraud and trickery to get what he wants. He feigned alliance with Lehonti so that he could kill him and take his place. Amalickiah did not do these wicked things outright and in the open, rather he did them in secret and "by degrees."  This is exactly how Satan works.  Satan pushes a little evil in with some good and gradually takes over.  He is super tricky.  This is why it is so important to pray and study the scriptures daily.