A listener's note, the following series includes descriptions of violence, sexual assault, and grooming.

It is not recommended for young audiences.

The people versus RoboShow and Riley is an ongoing case.

At the time of this episode's original air date, neither of the defendants had been convicted of any crimes.

Around 11.30pm on October 2, 2016,

83-year-old Coran Gibson was getting ready for bed at her home in Newport Beach, California.

When she was startled by an insistent noise coming from the alley behind her house.

I was in bad, my husband was out of town, and off of my bedroom I have a little death that looks on the 43rd street.

We're on 43rd street. All of a sudden I heard this terrific scream, I held, and it was just sounded really desperate.

I remember what is that? I think I heard three times.

I remember I got out of bed, and I went to the deck to look outside because it was coming from the ocean side.

But I could tell where it was and see anybody.

Coran, who has feathery white hair and a warm, easy smile, had an urge to run outside.

But her husband was out of town, and she was in her pajamas.

And anyway, she could see from the deck off of the bedroom that her neighbor Austin had already taken off on foot to see what was happening.

So I came back in and called 911, and I just said,

somebody's yelling, how it sounds frowning, and I've never heard anything sound like that.

And please hurry.

Then Coran went downstairs to the alleyway, where a group of neighbors had already assembled.

The police car came immediately, and two of them ran between the houses.

But one on the corner is the crime scene, and the other one is next door.

And we couldn't tell which house it was. We didn't know.

...