Crime: Idaho college murders: Police investigating report that victim had stalker

Idaho murders: Fox News’ Ted Williams pushes back against ‘peeping Tom’ theory: 'More personal'

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Authorities said they are aware of reports that one of the slain University of Idaho students, 21-year-old Kaylee Goncalves, had a stalker.

"We're aware of these various reports and we're investigating," Idaho State Police spokesman Aaron Snell told ABC News on Tuesday.

The other students killed in the off-campus house in the early hours of Nov. 13 were Ethan Chapin, 20; Chapin's girlfriend, Xana Kernodle, 20, and Goncalves' lifelong best friend, Madison Mogen, 21.

MORE: Idaho college murders: Timeline of events

Although no suspects are in custody more than one week after the four students were stabbed to death, Snell said he remains "optimistic."

University of Idaho victim's father says Xana Kernodle had 'bruises,' put up a fight against killer

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"There is a piece of evidence out there somewhere that's gonna help us solve this case," he said.

Community members are in fear, Snell said, but they're also patient. While police can't release certain information, Snell said, "We continue to work hard and we want the community to know what we're doing."

Candles and flowers are left at a make-shift memorial honoring four slain University of Idaho students in downtown Moscow, Idaho, on Nov. 15, 2022 © Nicholas K. Geranios/AP Candles and flowers are left at a make-shift memorial honoring four slain University of Idaho students in downtown Moscow, Idaho, on Nov. 15, 2022

More than 100 investigators, officers and support staff have fielded about 600 tips, officials said Sunday. As the tips pour in, each has been processed, vetted and cleared, according to the Moscow Police Department.

Investigators said they're searching for surveillance video and are asking for tips from anyone “who observed suspicious behavior.”

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  Idaho student murders: Former officers say police 'jumped the gun' with initial 'targeted' attack statement Two former detectives with the LAPD and NYPD weigh in on information police have released regarding the murders of four University of Idaho students.The Moscow Police Department (MPD) described the attack as isolated and targeted in a Tuesday press release. Authorities have since revealed that the victims — Ethan Chapin, 20; Xana Kernodle, 20; Madison Mogen, 21; and Kaylee Goncalves, 21 — were stabbed to death, possibly while asleep, at about 3 a.m. or 4 a.m. on Nov. 13.

Investigators have also released timelines detailing the whereabouts of the victims and the other students who lived at the off-campus house.

MORE: Idaho stabbing victim Ethan Chapin 'lived his best life' at college

ABC News contributor and former FBI agent Brad Garrett told "Good Morning America" on Monday that the killer or killers may have been familiar with the layout of the house.

“It tells me that someone came into the house with a comfort level -- that they probably knew their way around the house,” Garrett said.

Two people place flowers at a growing memorial in front of a campus entrance sign for the University of Idaho, on Nov. 16, 2022, in Moscow, Idaho. © Ted S. Warren/AP Photo Two people place flowers at a growing memorial in front of a campus entrance sign for the University of Idaho, on Nov. 16, 2022, in Moscow, Idaho.

The Moscow Police Department said it has dedicated four detectives, 24 patrol officers and five members of its support staff to the investigation. They’ve been joined by a wave of outside investigators, who’ve taken over Moscow, a college town with about 25,000 residents.

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The FBI sent 22 investigators to Moscow, according to the local police. Another 20 agents were working on the case but located in Treasure Valley, Idaho; Salt Lake City, Utah; and West Virginia. Two members of an FBI behavior analysis unit were also working on the case, police said.

The murder weapon remains missing, police said.

MORE: Idaho college murders: Other friends were in house when 911 call made, police say

Two roommates were in the house at the time of the murders and appeared to have slept through the crimes, according to police.

A 911 call on Nov. 13 from inside the house was made on one of the surviving roommates’ cellphones, police said. The roommates told authorities that someone was passed out and wouldn't wake up, officials said.

"Multiple people talked with the 911 dispatcher before a Moscow Police officer arrived at the location," officials said. "Officers entered the residence and found the four victims on the second and third floors."

Garrett said investigators should be broadening their search outside the victims' immediate circle of friends and family.

“You’re going to have to start spreading out to people they had just a casual relationship with,” he said.

ABC News' Emily Shapiro, Kayna Whitworth, Connor Burton, John Capell, Melissa Gaffney, Marilyn Heck, Izzy Alvarez and Flor Tolentino contributed to this report.

Idaho murders: What we don't know about the brutal slayings of 4 university students .
Four Idaho college students were brutally killed more than one week ago -- and police haven't identified any suspects or zeroed in on a motive in the baffling quadruple homicide.Ethan Chapin, 20, Xana Kernodle, 20, Madison Mogen, 21, and Kaylee Goncalves, 21, were stabbed to death Nov. 13 between 3 and 4 a.m. on the second and third floor of a rented house near campus and fraternity row.

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