Tonight on Dateline.

She loved horses. She was a horse girl.

Well, he was just, he was a cowboy.

You never ever thought that something like this would touch your life.

That somebody would break into your home and kill you.

My sister was stabbed. Tim was stabbed.

It was pretty much gut-wrenching devastation. The major scene took place inside the house.

What did you see when you got in there? A lot of blood. Probably the worst scene in my entire career.

There were some strange goings on before this occurred. Tim's truck was blown up. Is that right?

There was an explosion and all of a sudden it was burning. He had gotten at least one threatening letter.

The letter scared me.

I just said, you need to be careful.

There were a lot of suspects, a lot of people who might have done it.

I thought that's insane.

There's been a mistake.

In my heart, I know he did not do this.

He's an innocent man.

30 years without an answer.

And then finally, there is one.

It's pretty tough to talk about.

I mean, murder is shocking, but this?

Two deaths, three decades, one shattering twist.

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