Two of the four students killed near a university campus in the US had made 10 phone calls to a man called 'Jack' just minutes before their death, it is claimed.
Madison Mogen, 21, Kaylee Goncalves, 21, Ethan Chapin, 20, and Xana Kernodle, 20, are believed to have been stabbed to death at a student home in Moscow, Idaho, on November 13.
The killings likely occurred between 3am and 4am that day, and the bodies were found around noon.
Kaylee's sister, Alivia Goncalves, has now alleged that her sibling called a young man named Jack 7 times on the morning she died, while Madison phoned him three times.
She told Inside Edition : "At 2.26am Kaylee starts to call Jack. Kaylee calls Jack six times between 2.26am to 2.44am, from 2.44am to 2.52am Maddie calls Jack three times, then Kaylee makes a final call to him at 2.52am.
"And they are both never heard from again."
Alivia reportedly found a video of her sister and Madison at a food truck shortly before they were killed, and also discovered they had taken an Uber.
She added: "I found neighbors’ ring camera footage so that I could verify that the Uber driver took them home."
Autopsy reports released on Thursday concluded the four students were murdered by being stabbed to death.
A county coroner has claimed to a cable news channel that the four students were killed in their beds and likely were asleep when they were attacked.
Latah County Coroner Cathy Mabbutt also told NewsNation on Thursday that each victim suffered multiple stab wounds from a "pretty large knife."
"It has to be somebody pretty angry in order to stab four people to death," Mabbutt said. The victims were stabbed in the chest and upper body, the coroner added.
In an evening statement, Moscow Police Department confirmed the coroner reported the victims were likely asleep and that some of the victims had defensive wounds. Police additionally said there were no signs of sexual assault.
Officers have not identified a suspect or found a weapon.
The killings have shaken Moscow, an Idaho Panhandle town of 25,000 residents that last saw a homicide about five years ago. The leafy college town is about 80 miles (130km) south of Spokane, Washington.
Moscow police released a map on Friday and later its statement with a rough timeline of events leading up to the deaths. It asked the public to provide any tips or leads.
The map showed that Chapin and Kernodle were seen at the Sigma Chi fraternity house between 8pm and 9pm Saturday. Police said it's believed the two returned to the home by 1.45am on Sunday.
Meanwhile, Goncalves and Mogen went to the Corner Club, a popular bar in downtown Moscow, from 10pm on Saturday to 1.30am Sunday. Then they visited a food truck on Main Street before using a ride-hailing service to return to the house by 1.45am.
Surveillance video from the food truck shows Goncalves and Mogen ordering at the window, taking photos on their phones and chatting with friends in a segment of about 10 minutes.
Police said on Friday that detectives do not believe a male seen in the video was involved in the crime.
The force said evidence at the scene leads them to believe the students were targeted, though they haven't given details.
Investigators say nothing appears to have been stolen from the victims or the home. Police also said online reports of the victims being tied and gagged are not accurate.
After initially saying there was no ongoing danger, police backtracked on their comments on Wednesday.
"We cannot say that there is no threat to the community," Moscow Police Chief James Fry said. "We still believe it's a targeted attack. But the reality is there still is a person out there who committed four very horrible, horrible crimes."
Two people found unharmed in the sprawling house, described by police Friday as roommates, are not believed to be involved in the case, the statement said.
Detectives are investigating nearly 500 tips and have done 38 interviews with people who may have information about the murders, police said.
The Idaho State Police, the FBI and the Latah County Sheriff's Office are assisting with the investigation.
