The oxygen the new true crime series A plan to kill delves into the stories of troubled killers playing the long game. They spend weeks, months and even years planning the death of their victims. The November 24 episode focuses on the 2013 case of Roger and Melissa Bluml, who were found murdered execution-style in their pickup truck outside their home near Wichita, Kansas. What follows is an investigation that uncovers a chilling tale of manipulation, revenge, and the ties that bind them.

For now-retired Undersheriff Gregory Pollock, the case hit close to home. He was a friend of the victims and worked tirelessly with other members of law enforcement to uncover the truth about who wanted them dead. In a shocking turn of events, the answer would be the couple’s own adopted teenage son, Anthony “Tony,” and his biological mother Kisha Schaberg. The two were sentenced to life in prison for the murder. Two of Tony’s colleagues also faced charges for their connection to the shocking murders. The show delves into their motives and more.

Here Pollock opens up about what viewers will find in the episode.

Gregory Pollock

What do you think will stand out about this project compared to other stories of this case?

Gregory Pollock: It really goes into all the planning that took place from all the people involved. It is also a very unusual thing. When you have so many suspects involved. There are details and things they thought about and tried to get away from. They spent a lot of time going over things that they thought would confuse law enforcement and we would have no idea what happened and what really happened. I think people will find it so interesting.

How was this tragic case looked back on more than a decade later?

Every time I talk about this case, it has a personal touch for me. I reflect on the friendships I had with Roger and Melissa and the times we had. It was such a tragic loss. There are a lot of emotions that are pouring out during this time. Only because of my connections with them.

What do you want people to know about this couple?

They were fantastic. They were a loving mother and father. They wanted the best for both boys. They did what I would say, everything right. They could not have children and followed the path of adoption. I tell you, things have been fantastic for a few years. They did things well as parents.

What was your reaction when you found out that Tony was connected to the couple’s murder? It had to be a punch in the gut.

Era. It’s something I never lose sight of. I went to the hospital in the morning. They were all still there. Melissa had just died. I went in to tell the whole family about the arrests and that we were getting ready to announce to the public that there were four suspects and one of them was Tony. The emotions in that room. I don’t think I’ll ever forget that day.

Have you stayed in touch with Tony’s brother Chris over the years?

I started and stopped. This year I don’t have as much as in other years. I know he is doing well. He is married and has children. He still works for the fire department and is doing well.

Talk a little bit about the police work involved and what was done to make sure this case didn’t go unsolved.

After about four days of searching and interviewing, I was following theories and thoughts. We looked at a botched robbery, a botched home invasion. We looked at the people involved in Roger and Melissa’s lives to see if they might be involved. We looked at both guys based on some initial information. We climbed naked everywhere. Then on the fourth or fifth day I got a call from where the gun was purchased. Things started to develop after that. One of the things that helped us the most was probably the surveillance operations that we did. I knew when Tony initially spoke to us on the first day that all of his statements seemed to be misleading and didn’t make much sense. So, we made a good call and put surveillance units in the right place. Everything paid off.

Anthony “Tony” and Kisha Schaberg (Sedgwick County Sheriff)

From your point of view, how difficult is it to work on a case when it involves victims you know?

At one point in the investigation, I wanted to make sure people understood my relationship with Roger and Melissa and the boys. I went and talked to the district attorney about it and made sure it wouldn’t be a conflict for anyone. I talked to my boss about it. I wanted to make sure it was still business as usual. At night I was visiting with my wife about the case and how things went. Just as things developed, being able to find a balance. I felt I could do this. Otherwise, I would have withdrawn from the case.

You just retired this year, how do you look back on your career and the work you’ve done?

Law enforcement generally does what I think is a fantastic job. I know there are some cases that get publicized that don’t paint a good image of law enforcement, but in the 30 years I’ve been on the job, I’ve worked with some very good people. The people who come in every day have worked hard and wanted to make sure they solve cases. It was a great expectation that I had for my people. That there are victims out there, some of them who can’t speak for themselves. We need to make sure that we are their voice and that we can do that by solving their case.

What do you want to tell the viewers before watching this episode?

Just to make sure we understand Melissa and Roger were great people in their community. Their deaths were a devastating loss and affected people and changed lives forever.

A plan to killSunday, 7/6c, Oxygen