MOSCOW, IDAHO – It was a gruesome quadruple murder that rocked a college campus and kept the nation on edge for weeks as investigators searched for the person responsible. deaths of Idaho State University students Ethan Chapin, 20; Madison Mogen, 21; Xana Kernodle, 20, and Kaylee Gonsalves, 21.

The suspect is Brian Koberger, 28, a Ph.D. student, is being held in custody in Idaho. He has not yet entered a guilty plea.

Friends and family of the slain students are left with questions, and many say their pain and desire for justice has intensified.

Ben Mogen, Madison’s father, said the news of Koberger’s arrest brought some semblance of relief.

“It was a huge weight that was lifted,” Ben Mogen said. “At the same time, I knew that I would have someone’s face in my head for the rest of my life. I just think I need to focus more on the fact that we caught someone. “

The new “20/20” program, which airs Friday, January 13th at 9:00 PM ET on ABC and will be streamed the next day on Hulu, provides a comprehensive look at the ongoing case and covers the latest details of the murder investigation.

“Horror in Idaho: Murder of Students” will also include emotional interviews with classmates, friends and family of the victims.

RELATED: Idaho College Killings Timeline: From Off-Campus Killings to Brian Koberger’s Court Appearance

Olivea Gonsalves said her sister and Mogen had been close since sixth grade and were like sisters. When the two started attending Idaho State University, they joined different sororities, but recently moved into an off-campus house together, according to Gonsalves.

“She didn’t plan to stay in Idaho, so she just had one last hurray with Maddie at the same house,” Olivea Gonçalves said.

Many friends we spoke to asked ABC not to use their last names.

Friends and classmates described Gonsalves as someone you could lean on and trust.

“She was in everyone’s corner. She was a voice for people who didn’t have a voice,” Katie, an Idaho State University student who was friends with Gonsalves and Kernodle.

Ava, another member of the group, said she has fond memories of Kernodle, who also lived in the house.

“I have never met a person like Xana before; she opened her arms wide and let me into her life the day I met her,” Ava told 20/20. “Her greatest joy in life was being happy and making others happy. I had a lot of respect for Xana because she always made me happy and her energy just poured out.”

Kernodle was dating Chapin, a fellow university student and member of the Sigma Chi fraternity.

RELATED: How Internet searches posting viral, misleading Idaho murder theories are causing safety concerns

Peter, a fraternity brother, said Chapin was “the kindest and most humble man I have ever met.”

“You can be around people who are always negative … Ethan is the opposite,” Peter told 20/20. When you’re in a bad mood, you want to find Ethan to cheer you up a little.”

[Ethan] was one of those people that when he looked you in the eye, you could see his heart,” Tyler Amaya, Chapin’s former basketball coach, told 20/20.

Amaya said news of the tragedy was “the worst news you could ever imagine”.

Friends and family of the victims said they are still reeling from what police say happened in the early morning hours of Nov. 13, as detailed in the unsealed affidavit that led to Koberger’s arrest.

The night before, Gonsalves and Mogen had gone to a local bar while Chapin and Kernodle were at the Sigma Chi house, according to investigators.

According to investigators, Gonsalves and Mogen returned to the home around 1:45 a.m. after stopping at a grocery store. Kernodle and Chapin, who did not live in the home but were sleeping that night, arrived at the home around the same time, police said.

Police say the four were beaten to death between 4am and 4:25am.

Two additional roommates in the home, whom police do not consider suspects, were not injured.

One of those roommates claimed she heard a commotion coming from Kernodle’s room and saw a masked man leave the house, according to a police affidavit. A 911 call was made later that morning and officers found the bodies.

Olivea Gonsalves said she was comforted by the fact that Kaylee and Madison were in bed together in their final moments.

“If I couldn’t be there to hold their hands and take that pain away from them, at least they were with each other. That’s honestly one of the most comforting things about it,” she said.

For more than a month, police searched for every tip and lead they could find in their pursuit of the suspect.

According to a police affidavit, they say a knife sheath found at the crime scene was linked to the DNA of Koberger, who attended Washington State University, which was less than 10 miles from the University of Idaho campus.

On December 30, Koberger was arrested at his family’s residence in Pennsylvania and charged with four counts of first-degree murder. He was extradited to Idaho five days later and is awaiting trial.

Jason LaBarre, Koberger’s public defender in Pennsylvania, said he is “seeking exoneration.” The suspect’s family released a statement expressing their condolences to the families of the victims and their love and support for Brian.

The investigation did not reveal the motive for the murders.

Olivea Gonsalves said when her family got the call about the arrest, it came with a huge sense of relief, but was also “emotionally crushed.” Still, Olivea Gonçalves said she tried to stay strong.

“I think a lot of people are wondering why I didn’t cry or be more emotional in those interviews. And for me, even before we got a name or an arrest, I could only imagine the driving factors of this person. The motivating factors of this person were pain and fear,” she said. “And that was one thing I could control, and that was not giving that pleasure. This person doesn’t see how he hurt me.”

On Dec. 15, Koberger was pulled over twice by Indiana police for traffic violations while on a cross-country trip with his father.

Labar said the father flew to Washington state to help Koberger make the long cross-country trip home for winter break.

The Hancock County Sheriff’s Office and Indiana State Police said at that time they had not been given any information about the suspects in the Idaho crimes or the white Hyundai Elantra.

“To know that he stayed in the community until at least December 12th, December 13th, about a month after these events, is definitely scary. It’s horrible to think about,” said Olivea Gonçalves.

As the case continues and more details about that night are likely to emerge, Olivea Gonsalves said she hopes the public remembers that her sister and Mogen were innocent victims who stayed out of harm’s way.

“They went to school, studied hard, worked hard, earned what they had with a lot of work. And even on that fateful evening, they did everything right,” she said.

“They did everything you would want your daughter or your sister to do in that situation. So I think remembering her as responsible, compassionate and smart is the most precious thing.”

Ben Mogen said he remembers his daughter as “a lot of people’s best friend.”

“If I had one or two words to describe Maddie, it would be ‘angel’. She just made me proud.”

Phoebe, another friend of the students, said the vigils held in honor of the four students were extremely sad but served as a reminder of the promise she made to the victims.

“We will live for you,” she said. “You are still in our minds and we will never let your stories go.”

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