David Muir

And so suddenly, all these years later, in a courtroom full of strangers, Paula is telling her story about how she was assaulted by Foreman.

And in the end, Clayton Foreman's defense, they wouldn't call any witnesses, but they did deliver a closing statement.

And in the end, Clayton Foreman's defense, they wouldn't call any witnesses, but they did deliver a closing statement.

It was an extraordinary thing to have closure in that courtroom for that young school teacher. And that other case, the mother who was brutally murdered, her baby just a few feet away. Now she's about to meet the couple who unlock this case. As we stand here today, all these years later, it's so peaceful and quiet here. It's hard to imagine what played out behind us.

It was an extraordinary thing to have closure in that courtroom for that young school teacher. And that other case, the mother who was brutally murdered, her baby just a few feet away. Now she's about to meet the couple who unlock this case. As we stand here today, all these years later, it's so peaceful and quiet here. It's hard to imagine what played out behind us.

Justice, finally, for that elementary school teacher, Catherine Edwards. And in the second case, justice as well for Kathy Swartz's daughter, Courtney. Hi, Courtney.

Justice, finally, for that elementary school teacher, Catherine Edwards. And in the second case, justice as well for Kathy Swartz's daughter, Courtney. Hi, Courtney.

Just the idea, though, that the two of them were able to go back and look at that evidence and solve it all these years later.

Just the idea, though, that the two of them were able to go back and look at that evidence and solve it all these years later.

Do you think that there are cases like this all over the country right now just waiting to be solved with this new technology?

Do you think that there are cases like this all over the country right now just waiting to be solved with this new technology?

There are tens of thousands of little tubes of DNA in crime labs across this country. And all of them have answers.

There are tens of thousands of little tubes of DNA in crime labs across this country. And all of them have answers.

For some families, you are the last hope.

For some families, you are the last hope.

And we should note that that lab, those DNA decoders, Kristen and David Middleman, Othram, they recently announced their 455th DNA match. Deborah, they are solving these cases.

And we should note that that lab, those DNA decoders, Kristen and David Middleman, Othram, they recently announced their 455th DNA match. Deborah, they are solving these cases.

And I'm David Muir from all of us here at 2020 at ABC News.

And I'm David Muir from all of us here at 2020 at ABC News.

Tonight on 2020, the so-called Golden State Killer, a 40-year-old cold case, back in the news tonight. The police are saying lock up tight. Sorry.