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Welcome to the true crime vault, home to 2020's most chilling stories.

We were scared. Who did it? Who did it?

Who killed her?

Can this happen to anybody?

Tonight on an all-new 2020.

A cold case murder for more than two decades.

Now, solved in just two days?

Giving up hope that they would find the person that did this

would have been giving up on her.

And he couldn't do that.

A young elementary school teacher who never showed up for work.

And I knew something was wrong.

So I'm yelling, Christy, Christy, Christy.

I told the police what I saw, but I've never told anybody else.

I understand that a priest at one point told you not to look at her.

He said it was probably our best interest. Not the viewer.

...