i cannot say no strong enough. there are so many choices you could use; protection and banishing, or a hex if you want to e touch, but killing these people is a last resort, and even then its not a great option.
no death spell is simple, nor is it straight forward or wise to cast. if you chose to do a death spell, even if its for the right reasons, you will be hit by the threefold law hard. a covenmate of mine cast on someone who hurt him, his brother, and many other people for many year. he reflected of the situation and meditated on it for a year before deciding it was the right thing to do. even though he took all the precautions [the man did die) he still received a lot of negative effects. [divorce for example]