Why didn't Thomas kill Darius immediately when he clearly hints he is behind his daughter's murder?

Why didn't Thomas kill Darius immediately when he clearly hints he is behind his daughter's murder? - Drone view of light beige sandy beach of vibrant green wavy ocean next to cottage surrounded by grass and palms

In Edge of Darkness (2010), Thomas and Darius talk about the mystery behind Emma's death.

Darius: They're simply too complicated, too much hard work. There's a lot going on out there in this world. And you just never can connect A to B.

Thomas: How do you know that?

Darius: Because I'm usually the guy that stops you connecting A to B. It's part of what I do.

He clearly indicates he is behind about her death and not allowing Thomas to know the truth about it.






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