Hi, crime junkies. I'm your host, Ashley Flowers. And I'm Britt. And I have a story today that is going to stay with you. And be warned, it is not for the faint of heart. What was done to the victim and how she was found is truly one of the most haunting images that I've had to convey in probably over 600 episodes at this point. But I am going to walk you through it all. From the night of the murder

on Valentine's Day 2007 to the brand new forensic techniques used today to identify the

killer, and ultimately to the chilling realization that our suspect was leading a double life.

On one hand, he was moving about the world like you and I,

acting out the part of father, partner, and friend. He lived and worked in the very town where he

also took on the role of Monster, a man who set up a crime scene in a way that allowed him to

watch as he desecrated the corpse of a young woman he'd killed in her own apartment.

This is the story of Jodine Sarin.

Music I'm going to be. I'm going to be. I'm It's Valentine's Day 2007.

And even after 53 years of marriage, Art and Lois Sarin don't skip out on a chance for a romantic date night of dinner and a movie to celebrate.

They try to plan a day just for

themselves because like many parents, decades of their lives have been consumed with taking care

of their six kids. And even more so for them because their youngest daughter, 39-year-old

Jodine, who goes by Jody, she had developmental disabilities that were told gave her the mental

capacity of a girl in her early teens. And Jody lived on her own, but in many ways she was still

dependent on her parents. They checked in on her every day. They helped her get from place to place

because she didn't drive. But on this day, they hadn't been able to get a hold of her.

72-year-old Lois tried pushing it out of her mind, like just one day where she and her

husband could just focus on themselves. It wouldn't be the end of the world. But all through

dinner, it was like nagging at her. And as she sat in the dark of the movie theater, she just couldn't focus on

the screen. With every scene change, she just grew more and more anxious till she couldn't take it

anymore. Like what's the point of being there if she can't actually enjoy it? Whatever feeling

...