I'm Lester Holt and this is Date Line.

Two women were attacked so brutally.

I would want the guy that did it too.

But you think they got the wrong guy?

I'm positive they have the wrong guy.

It started with a savage assault.

I could see two girls laying there.

It was horrifying.

There was duct tape on their mouths, on their hands.

I couldn't fathom who would do this to them.

One girl dead.

But miraculously, the other survived.

I'm just like praying, please God, don't let me die.

The hunt for their attacker went nowhere.

Then a mysterious message.

The letter is written from the perspective of a hitman.

We moved to an arrest very quickly.

If you looked at it, it would probably think him capable of this.

But he certainly lost.

Was he?

Some said a critical crime scene clue was ignored.

Let's presume that we came from the person who attacked them.

...