Deborah Roberts

And then someone comes up, oh, hey, yeah, what do you have to say?

What do you have to say?

Like, dude, like, get out of our face.

It just went absolutely insane, but that's how the world is now, so.

Just trying to get through the days is really all I was doing.

You don't feel safe in any situation like that for months.

Like, there's no feeling secure or safe.

I mean, after the first couple of weeks, we're like, this guy's going to get away with this.

But then, nearly seven weeks after the murders, finally an arrest.

My mom just came into my room, and she's like, hey, hey, they got him.

It was really shocking to learn he was a WSU student who had moved out to Washington and Pullman that summer to study at Washington State University.

He was pursuing a PhD in criminology and justice.

For the first time, you'll see some of the hundreds of photos released by authorities just this week.

They offer a glimpse into the secret life of Brian Koberger, and you'll hear what investigators learned from analyzing his digital life.

He was a loner, no friends, no one really except for his parents.

He called them mother and father, even through text message.

But first tonight, we want you to get to know Kaylee, Maddie, Zanna, and Ethan, who they were, how they lived their lives.

And you'll hear how investigators say Koberger planned meticulously to end it all.

Dylan had opened her door, and as she looked out, saw an individual in all dark clothing.

Then she thought she heard a male voice say, I'm here to help you.