David Muir

You live in Texas, and you know if you want to land a case in Texas, you've got to get to the Texas Rangers. But how did you convince them that we've got a tool here?

Well, the one that I've done the most work with is Ranger Brandon Bess.

Well, the one that I've done the most work with is Ranger Brandon Bess.

And he had one case in mind. They told me it was the most heinous thing that had ever happened that was unsolved in Beaumont.

And he had one case in mind. They told me it was the most heinous thing that had ever happened that was unsolved in Beaumont.

That other case, that young school teacher, 31-year-old Catherine Edwards.

That other case, that young school teacher, 31-year-old Catherine Edwards.

What was unique about this case? The victim was a schoolteacher, well-liked by everyone. There was no sign of forced entry. So this is a very odd situation. It just didn't add up.

What was unique about this case? The victim was a schoolteacher, well-liked by everyone. There was no sign of forced entry. So this is a very odd situation. It just didn't add up.

And that officer, Carmen Brown Apples, has the memory of her entering Catherine Edwards' townhouse has played over and over again in her mind for decades. You remember walking in and what you discovered?

And that officer, Carmen Brown Apples, has the memory of her entering Catherine Edwards' townhouse has played over and over again in her mind for decades. You remember walking in and what you discovered?

What did you find as far as the bedroom and the bathroom?

What did you find as far as the bedroom and the bathroom?

Investigators learned that her sister, Allison, was likely the last person, aside from the killer, obviously, to see Catherine alive. Allison would tell detectives that her twin sister arrived at her house after work to pick up her beloved beagle, Maggie.

Investigators learned that her sister, Allison, was likely the last person, aside from the killer, obviously, to see Catherine alive. Allison would tell detectives that her twin sister arrived at her house after work to pick up her beloved beagle, Maggie.

Of course, in these cases, it's standard procedure for investigators to look at those closest to the victim. And really, from the beginning, her ex-boyfriend is seen as a prime suspect. But critical evidence from the scene actually points in a different direction.

Of course, in these cases, it's standard procedure for investigators to look at those closest to the victim. And really, from the beginning, her ex-boyfriend is seen as a prime suspect. But critical evidence from the scene actually points in a different direction.

Now we've just got to match it. The DNA actually doesn't match her ex-boyfriend, and he's now cleared in the case. And there are no matches to the DNA in CODIS, which is the National Criminal Offender DNA Database, either.

Now we've just got to match it. The DNA actually doesn't match her ex-boyfriend, and he's now cleared in the case. And there are no matches to the DNA in CODIS, which is the National Criminal Offender DNA Database, either.

The case would go cold for decades. And obviously, it's just one of hundreds of thousands of unsolved murders in this country. But then in 2020, two investigators, Ranger Brandon Best and Beaumont Police Detective Aaron Llewellyn, decided to take a fresh look at the case. At the time, Best had just been connected with this new lab called Othram.