David Muir

So now the hope is, can the latest science help match who this DNA actually belongs to?

We have tested hundreds, hundreds of people, first responders, serial killers, family members, police officers, against that YSTR profile we've had to try to identify

the individual without success for years.

But at some point, the Austin Police Department formally requested that the newly formed cold case unit within the AG's office assist APD with this investigation.

I was told you're going to really be excited because we've got this new detective coming on board.

And enter Dan Jackson.

So this is the entryway to the cold case office.

The first thing you see when you start your day is this here.

And what we have is a to-scale diorama of the strip mall where the yogurt shop is located.

And then we also have here is pictures of the four girls and a short biography about each girl and then a slight or short synopsis of the case.

And it sort of reminds you while we're out here and what we're doing here and why this unit was actually started to begin with was to work this case.

When I took the case over, I was like, this case will never progress.

until you figure out who that unknown profile is.

We had sent a couple of things off that didn't result in anything promising.

So yeah, all the leads ended up going nowhere.

And then at the end of June of 2025, I don't know why I went down this rabbit hole, but I was thinking about that 380 cartridge that was pulled from the drain, thinking about what we could do with it.

The ATF maintains this database, and now you can take your expended shell casing, give it to Niven, and they will do one of these computer searches, and they will search this database of thousands and thousands of other expended shell casings, and remarkably, every once in a while, you get a hit.

One of our detectives submitted it.

And that afternoon, my phone rang, and he was like, hey, you got a second?

So he called, he goes, hey, I'll put you on speakerphone with a couple of people.