THE SOURCE: LOST (tv series)
LOCKE: You told her not to talk to me. That made her pointless... Now, Charles, it's clear you're not afraid to die. So, there's only one way to motivate you to tell me what I want to know. Soon, this will all be over. I'll get what I want. And I'll finally leave this island. And when I do, the first thing I'm going to do is kill your daughter...Penny.
Why the writer did use “kill” instead of killing
- Killing you daughter is the first thing I am ...