Oxygen new true crime series A plan to kill delves into the stories of disturbed murderers who play the long game. They spend weeks, months, even years, planning the deaths of their victims. The November 24 episode centers on the 2013 case of Roger and Melissa Bluml, who were discovered murdered during an execution in their van outside their home near Wichita, Kansas. What follows is an investigation that reveals a chilling story about manipulation, revenge and the ties that unite them.

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

Here, Pollock explains what viewers will find in the episode.

Gregory Pollock

What do you think will come out of this project compared to other accounts of this case?

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

How have you reflected on this tragic case more than a decade later?

Every time I talk about this matter, it affects me personally. I reflect on the friendships I had with Roger and Melissa and the times we had. It was such a tragic loss. A lot of emotions emerge during this time. Just 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 these two boys. They did what I would say, everything is fine. They were unable to have children and chose the route of adoption. I tell you, things have been fantastic for several years. They did things well as parents.

What was your reaction when you found out Tony was linked to the couple’s murder? That must have been a punch in the gut.

It was. This is something I never lose sight of. In the morning I went to the hospital. Everyone was still there. Mélissa had just died. I went in to tell the whole family about the arrests and that we were preparing to announce to the public that there were four suspects, including Tony. The emotions in this room. I don’t think I will ever forget this day.

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

I turned it on and off. This year I don’t have as many as other years. I know he’s okay. He is married and has children. He still works for the fire department and is doing very well.

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

After about four days of research and interviews, we were following up on the theories and thoughts. We saw a botched theft, a botched burglary in the house. We looked at the people involved in Roger and Melissa’s lives to see if they could get involved. We looked at their two boys based on some initial information. We come back empty everywhere. Then, on the fourth or fifth day, we received a phone call that the gun had been purchased. Things started to unfold after that. Probably one of the things that helped us the most was the surveillance operations that we conducted. We knew when Tony first spoke to us on the first day that all of his statements seemed misleading and didn’t make much sense. So we made a good choice and placed monitoring units in the right place. It all paid off.

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

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

At one point during the investigation, I wanted to make sure people understood my relationship with Roger, Melissa and the boys. I went to talk to the prosecutor 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 I was still conducting business as usual. At night I would visit my wife to talk about the case and how things were going. As things evolved, being able to find a balance. I felt like I could do that. 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 have accomplished?

Overall, law enforcement is doing what I consider to be a fantastic job. I know that some of the cases that are made public don’t reflect well on law enforcement, but in the 30 years that I’ve worked, I’ve worked with some very good people. The people who came in every day worked hard and wanted to make sure they solved the cases. It was a big expectation I had for my parents. That there are victims, some of whom cannot speak for themselves. We need to make sure we are their voice and we can do that by solving their case.

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

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

A plan to killSunday, 7/6c, Oxygen