On November 13, an unknown attacker killed University of Idaho student Goncalves, 21, as well as her flatmate Madison Mogen, 21, and couple Xana Kernodle and Ethan Chapin, both 20, in their off-campus home.

Authorities have said that they believe that the incident was a targeted attack but have not named any suspects as they press on with their investigation.

They also noted that two surviving roommates, who were in the home at the time of the attack and were unharmed, are not suspects.

Alivea Goncalves, sister of Kaylee, discussed the investigation with NewsNation’sChris Cuomo on Monday.

Cuomo said: “The two other roommates have been cleared, are you okay with that?

She replied: “I think that, I hope that they are doing well.

“I can only trust law enforcement has done their due diligence in all of the people they have cleared thus far.”

Goncalves praised the police for ruling out her sister’s ex-boyfriend as a suspect. Cuomo noted that on the night of her death, Kaylee Goncalves had called her ex several times.

“I completely agree [with the police that it is a non-issue],” she said.

“I couldn’t be any happier to see that they have cleared him. From the beginning, I knew that it wasn’t him and I am happy that they are focusing their attention somewhere else now.”

Two weeks since the attack, no weapon has been found, though police have said they believe a “fixed-blade knife” was used.

The victims are believed to have been asleep when the attack began and some had defensive wounds, according to the Latah County Coroner.

Speaking previously to Newsweek, Joseph Giacalone, a retired New York Police Department sergeant and adjunct professor at John Jay College of Criminal Justice, said key evidence could be on the victims’ bodies.

Due to the nature of the attack, he noted that the “chances that one of the victims scratched the perpetrator [are] pretty high.”

“They’re trying to defend the attack off, and they’ll do anything they can, gouge their eyes or their face and that is a real possibility. But if you didn’t bag the hands when you took the bodies out or at the time, you can have a chance of losing that kind of evidence.”

Newsweek has contacted the Moscow Police Department for further comment.