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Many put their hope in Dr. Serhut. His company was worth half a billion dollars.

His research promised groundbreaking treatments for HIV and cancer.

But the brilliant doctor was hiding a secret.

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They came here to his house and found him. He'd been dead for several days.

My oldest brother called and told me.

What did he say?

He just said, Carl's dead?

As soon as he said Carl's dead, I already know who did it. I knew it was her.

She told us a story about how Brazil, basically they just don't extradite.

She knew all she had to do was not get caught until she got to Brazil and she was home free.

You're describing a cold blooded premeditated.

Absolutely.

We knew it wasn't going to be easy. I don't think we thought it was going to take more than ten years.

I'm Aaron Moriarty, 48 hours. And this is my life of crime.

How much would you do to get justice for your brother?

This is the story of Paul Herrick. He's an Ohio man who spent more than a decade tracking down the killer of his brother.

We begin in Newton Falls, Ohio, once the home of a local hero.

Air Force reserves pilot Major Carl Herrick.

The way I've heard him described his fearless.

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