Harold Dow

Vulgar, anonymous letters were mailed to Lyles' children.

They are dripping with venom and anger.

Prosecutors believe Margaret feared Lyles was going to steal Ron and his money.

Did you write the letters?

No, I did not.

There is absolutely no way that Sue Lyles was ever a threat to my marriage in any way, shape or form.

Margaret does admit knowing all about Lyles.

How?

According to police, she tapped Ron's phone.

Can you tell me what his reaction was to the letters?

That confrontation, prosecutor Chris Owens theorizes, sent Margaret into a rage, ending in Ron's murder.

And the last thing he'd said to this girlfriend was, I'm going to go talk to Margaret about these.

And so the next night, he disappears.

According to prosecutors, Margaret shot Ron and used a trunk to get his body to the desert.

The state's star witness says she knows firsthand how anxious Margaret was to be free of her husband.

But this isn't just any witness.

You are the sister of Margaret Rudin, is that correct?

Donna Cantrell, Margaret's own sister, is testifying against her.

No.

What's it like for a mother to see one of her daughters do something like this?