Mr. Ballin

So Park knew that when the lab called this time, he'd either be on his way to finding the killer's name or his case would basically be over.

But then Park's phone finally rang.

He immediately picked it up and his mouth went dry when he heard it was the lab on the other end.

And before Park could even ask them, they told him they had a profile.

They'd been able to find traces of DNA in that dirt sample taken from under Barbara's body.

And when Park finally got his hands on that DNA profile and he ran it through their criminal database, he got a name.

Based on DNA evidence and a decades-long investigation, here is a reconstruction of what police believe happened to Barbara Rockey on March 11, 1974.

Just before noon, the killer watched Barbara pull up to the sidewalk in her car.

The killer immediately walked over and jumped inside and smiled at Barbara, and she smiled right back.

And together, they drove to the pawn shop in Salt Lake City that Barbara wanted to go to.

When they got there, Barbara hopped out of the car and went inside.

And once she was inside, the killer moved over to the driver's seat.

And so they basically were going to drive the car from that point forward.

And as the killer sat in the driver's seat waiting for Barbara, their heart was racing.

They couldn't wait for her to get back outside and get in the car because the killer was in love with her and they had decided that today they were finally going to make their relationship physical.

So when Barbara came outside and hopped in the passenger seat of the car after selling her necklace, the killer very excitedly turned to her and said, hey, there's some trails nearby.

Why don't we go for a hike?

Barbara clearly hesitated like she didn't really want to do this.

the killer knew barbara was leaving utah and they knew she had written a goodbye note and was selling the necklace for funds to leave for good so they kind of guilt tripped her they said look like let's go enjoy the beautiful countryside before you leave town barbara shrugged and said okay fine and so the killer very excitedly drove the car over to the canyon and parked near a picnic area

Then the two of them got out and as they began walking towards the trail, the killer reached down and touched the outside of their pocket, just to make sure the gun that they had stolen from Barbara was still there.