Lyndon Blake

that she believes her mom's alive and she believes her mom is out there.

And now that we have this footage, these images, this video, now the investigators can start putting together the trail.

They have the reflective backpack, shoes, who walks like this.

They have this person on video and now they can start looking days prior, a week prior at other places around town for someone that matches this description and you start building out the path themselves

leading up to the moment that this person's on Nancy Guthrie's front porch.

It is so helpful when you have who you're looking for and you can start building out this story.

And then the case doesn't seem so complicated.

When you know who you're looking for, you can get to an answer very quickly.

I want to remind you guys, at the beginning of this investigation, the biggest thing was Nancy Guthrie needs her medicine.

She needs her medicine to survive.

She can't go 24 hours without her medicine.

I talked to former Arizona Sheriff in Pinal County, Mark Lamb.

He has decades of experiences covering cases like this.

And I asked him about the medication because that's the one big question mark that we don't have.

I guess I should say one of many big question marks that we don't know in this case.

But has Nancy been taking her medicine?

Listen to his insight.

So there you have it.

There's no true clarity on the medication.

But again, Savannah Guthrie says she believes her mom is still alive.