Deborah Roberts

I can't imagine that being my child and knowing that there's someone out there that could help.

We have to help.

How fast can we get this DNA?

That DNA extract contained a lot of DNA.

It was not a trace amount of DNA.

It was 500 times more DNA than we generally see in our low-quantity DNA cases.

The technology at Othram is then able to build a profile that's uploaded to genealogy databases, which search for people who are connected to that unknown DNA.

In this particular case, there was a unique biogeographical ancestry that allowed us to kind of narrow the search even early on.

While there's a massive, multifaceted investigation working to find him, Ryan Koberger leaves Washington and heads home to Pennsylvania for winter break.

He drives across the country with his father in that white Hyundai Elantra.

Hello.

So it's a long trip from Moscow, Idaho, all the way to Pennsylvania.

Koberger's pulled over twice during this time.

Right up on the back end of that van, pulled you over for tailgating.

So y'all work at the university there?

And he's pulled over for following a vehicle too closely both times.

By the time the co-workers arrived back in Pennsylvania, the FBI had taken over that genetic genealogy search from Othram.

And just over a month after the murders, investigators get a name.

On December 19th, the investigative genealogy team leader calls in and he says, hey, Darren, he goes, I have a first name for you.

It's Brian.