B.K. Norton, who was in the same graduate program as Mr. Kohberger, said that he continued attending classes after the killings had occurred and seemed more animated at that time than he had been earlier in the semester.
The college town of Moscow, Idaho, has been reeling since the attack last month, but the police gave no motive for the murders.
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“He seemed more upbeat and willing to carry a conversation,” Ms. Norton said in an email. She said Mr. Kohberger was interested in forensic psychology.
Ms. Norton said Mr. Kohberger’s quiet, intense demeanor had made people uncomfortable, as had comments he made against L.G.B.T.Q. people.
“He sort of creeped people out because he stared and didn’t talk much, but when he did it was very intelligent and he needed everyone to know he was smart,” Ms. Norton said.
From 2:26 to 2:52 a.m., seven unanswered phone calls were made from Ms. Goncalves’s phone to a former boyfriend. Several calls were also placed to the same man from Ms. Mogen’s phone, the police said. The former boyfriend had not answered the phone because he was sleeping at the time, Ms. Goncalves’s older sister later said.
When the two surviving roommates woke up, they called friends to the house because they believed that one of the women who lived upstairs “had passed out.” When the friends got there, someone in the group called 911 just before noon, and the police arrived to find the victims and what the coroner later described as a bloody scene.