Detective with close ties exposes jealous teen's plan to kill adoptive parents with birth mom's blessing.

Gregory Pollock didn't want to inform his wife that their friends, Roger and Melissa Bluml, had been shot in the head outside their Kansas home.

"Pollock, who was at home when he received the phone call, immediately recognized the address and knew it would be a tough case. He was sitting with his wife at the time and didn't want to tell her anything until he went out onto the scene first. However, the overwhelming nature of the case became clear to him as he began to investigate."

The 2013 execution-style murders were the focus of Oxygen's true-crime series, "A Plan to Kill," which delves into the true stories of disturbed killers who meticulously planned the deaths of their victims over an extended period of time.

The program includes fresh interviews with investigators who worked on the cases, as well as the family members of the victims.

"Pollock stated that the case that did not go to trial still has some unknown details, as there were actions committed by suspects and work done by law enforcement that the community is unaware of. He felt it was necessary to disclose what happened."

The Blumls were a "loving couple" who longed to be parents. Their dream came true when they adopted brothers Anthony "Tony" and Christopher "Chris" Bluml as young children.

Pollock stated that Roger and Melissa were well-respected members of the community, known for their kindness towards one another and their enjoyable personalities.

"Roger and Melissa were two wonderful individuals whom I have known for several years. They were both kind-hearted and had unique personalities. Roger had a contagious sense of humor, and his laughter could be heard from across the room. On the other hand, Melissa was always ready to lend a helping hand wherever it was needed. Their selflessness and kindness were truly inspiring, and they both played a significant role in our families' growth."

In high school, Tony and Chris excelled at wrestling and football, and as they grew older, they seemed to be thriving with the Blumls.

"Pollock recounted the memory of being present when the boys were first adopted. He recalled the conversation they had with Roger and Melissa, where they were thrilled about having food on the table and being able to eat regularly. As the boys grew older, they developed respect for their adoptive parents. They participated in sports and followed the household rules. Overall, Pollock believed that the boys were doing well."

During Tony's senior year, he became involved with a group of friends who led him down a negative path, according to Pollock. Oxygen reports that Tony was caught smoking marijuana and had a confrontation with his parents.

An 18-year-old, according to court documents, displayed "violent behavior" and was eventually kicked out of the house. The Ark Valley News reported that he supported himself by working at fast-food restaurants, staying with friends, and selling marijuana.

Tony reconnected with his birth mother, Kisha Schaberg, on Facebook after deciding to reconnect with her. Court documents showed that Tony and his friend, Braden Smith, traveled to California to stay with Schaberg. Reports indicated that the trio often spent their days "in a drug-induced haze."

According to court documents, when the group exhausted their funds, they relocated back to Wichita, Kansas.

Schaberg reportedly said several times that the Blumls should be killed so that she, Tony, and Chris could be reunited as a family. It is believed that Schaberg was upset that Chris wanted "nothing to do with her." She blamed the Blumls for supposedly turning her son against her.

"Pollock stated that Kisha is a highly skilled manipulator, able to control not only Tony but anyone else she encountered. She employed a variety of manipulation techniques and was successful in her efforts. Kisha was able to convince all the young men of her ideas, making her a formidable force. Pollock concluded that Kisha is pure evil."

Tony, as per the episode, frequently expressed his desire for his mother's approval to Schaberg, complaining about the strict Blumls and how they favored his younger brother over him. He often resented them for kicking him out of their home while his brother was doted on.

Smith, who reportedly got cold feet, allegedly recruited his pal Andrew Ellington to take his place in the plan to kill the Blumls, according to court documents.

Smith asserted that Tony was the one who selected the date, November 15, 2013. That night, Chris would be absent at a wrestling event. The plan was for Tony to dine out with the Blumls and remove them from the house. Upon their return, the Blumls would be murdered, giving the impression of a botched burglary.

Tony believed that after their deaths, he would inherit a substantial amount and be reunited with his biological mother permanently.

"In 2013, we discussed various issues with Tony with Melissa and Roger, who were seeking assistance and potential solutions. We also explored different strategies they could implement. Despite our efforts, they ultimately deemed Tony a threat due to his drug use, even up until the final week."

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"Pollock continued, "Melissa stopped by to discuss Tony's visit. Although she was still cautious about the outcome of their meeting, Tony wanted to meet us and go out for dinner. He also required a copy of his birth certificate. We spoke with her that evening for approximately an hour, both my wife and I. Melissa informed us that she would update us on the dinner's outcome.""

On the evening of Nov. 15, Tony dined out with the Blumls while Schaberg and Ellington broke into the house and rummaged through the dresser drawers, staging a burglary.

Tony texted Ellington that the Blumls had dropped him off at his hotel and were on their way back. When the Blumls arrived, Schaberg shot the couple from the passenger side of their vehicle. Schaberg gave Ellington Melissa's purse and cellphone to dispose of them.

The following day, Melissa died at the age of 53. Five weeks later, Roger passed away at the age of 48. Chris, 16, returned home just after 9 p.m. and discovered the bodies.

"According to Pollock, Kisha's motivation for killing Roger and Melissa was to reunite her family. She believed that this would allow her to have full custody of her boys again."

"Pollock stated that the suspects put a lot of effort into concealing themselves from law enforcement, but their planning ultimately failed. As a result, we were able to detect their deception and uncover more information, leading to a trial where the outcome was certain."

A schoolmate of Tony's, who identified himself as such, provided a tip to the police, according to Oxygen.

According to Amy Renee Leiker, a reporter for the Wichita Eagle, a friend of the shooter, an 18-year-old named Braden Smith, had sent him a text message a few days before the Blumls were shot, requesting a gun for a job.

The suspects identified as Schaberg, Smith, Ellington, and Tony were investigated for the slayings. Although Schaberg denied any involvement, the other boys confessed and provided information that led to evidence.

In 2015, Schaberg and Tony were sentenced to life in prison without the possibility of parole after pleading no contest to aggravated robbery and capital murder charges to avoid the death penalty.

Oxygen reported that Ellington was given a life sentence but has the possibility of parole after 25 years, while Smith pleaded guilty to second-degree murder and was sentenced to 24.5 years in prison.

"Pollock stated that Roger and Melissa took every effort to ensure the boys' success, as their ultimate goal was to improve their lives and make a positive impact on society."

"If you searched for the word 'evil,' I believe Kisha's image would be included in that definition," he stated. "She is exactly where she should be at this moment."

"A Plan to Kill" airs Sundays at 7 p.m. on Oxygen.