If you can keep them from killing each other, that would be good.
How you going to keep this guy from killing himself?
He will do almost anything to keep me from killing myself.
I had only one chance to keep him from killing you.
The other one tried to control the mother and keep her from killing me.
Perhaps he'd killed himself to keep from killing more women.
Keep them from killing the girl, and I'll do the rest.
But also it was trying to keep anyone else from killing me.
What do I say to keep him from killing me?
It took everything I could do to keep him from coming here and killing you.