I was just in hysterics crying. I'm like there's blood on the pillow.

Someone was stalking the young women of Reno and now one of them had vanished.

There was obviously, you know, it was something really bad.

Her name, Brianna, she was just 19 years old.

I just want to say to my daughter, Brianna, that I love you and I miss you and nobody's ever giving up.

Nobody was giving up, but nobody was any closer to solving the mystery. Where was Brianna?

With any three mile radius, there were hundreds of registered sex offenders.

Then a tip about a woman who'd found something odd in her boyfriend's truck.

Women's underwear. And when she asked him for the truth, she discovered something even stranger.

Did you do this? Oh my God, did you do it?

I'm Lester Holt and this is Deadline.

Here's Josh Mankowitz with The Night, Brianna vanished.

Sunday, January 20th, 2008, in a neighborhood just up the hill from Reno's silver-plated heart,

college students Jessica Deel and Katie Hunter.

We're waking up after a long night of music and partying with their friend Brianna Denison.

Brianna, back home, visiting her friends, had slept on the living room couch.

But when Jessica Deel woke up...

We went out to the kitchen, started making breakfast.

The kitchen was right in front of the couch. And Brianna wasn't sleeping there anymore.

At first, they weren't concerned.

And we figured maybe she was upstairs in one of the roommates' empty rooms.

Katie went upstairs to the bedroom to see if Bri was sleeping there.

...