The murderer who ruthlessly slaughtered four University of Idaho students is likely a “younger” man and a first-time killer, famed former FBI profiler Jim Clemente said.

Clemente, a criminal behavioral expert and former New York State prosecutor, believes the person who killed Kaylee Goncalves, 21, Ethan Chapin, 20, Xana Kernodle, 20, and Madison Mogen, 21 on Nov. 13 likely knew at least one of the victims.

“This is an extremely risky crime for the offender — unless he knows one or more of the victims, or he’s been stalking one of them,” he told The Post on Wednesday.

“Going into an occupied dwelling with six young adults, any of whom could have a knife or a gun or a cell phone to call the police is extremely risky unless you know the circumstances inside.”

The former FBI profiler feels certain the killer is a man and pointed out they must be comfortable with blood to be able to fatally stab four people in quick succession, and might be a hunter or work as a butcher.

“He doesn’t mind the wet work of getting his hands dirty, and his profession will probably say the same thing,” he said. 

Clemente said he believes it was a targeted attack, but the killer “may not have known which room exactly the person was going to be in.”

“They may have stopped at four victims because they got to their intended victim,” he said, noting it likely was not a “random attack.”

Police apparently described the knife-wielding killer as “sloppy,” and said the aftermath of the murder was the most gruesome scene they had witnessed. 

“I don’t think he’s the experienced killer. I don’t think this guy’s done this before,” Clemente said, adding the stabber may have been motivated by “revenge or rejection or some kind of insult.”

Pete Yachmetz, a security consultant and former FBI agent, agrees with Clemente.

“I feel the subject maybe a young unsophisticated person because the crime scene was apparently massive,” he told The Post. “Going into an occupied home where there were six people in different rooms in the middle of the night is pretty dangerous.”

Police in Moscow, Idaho have yet to name a suspect and have provided conflicting stories about what happened before the murder. They have also been unable to confirm reports Goncalves being stalked.

“Investigators have looked extensively into information they received about Kaylee Goncalves having a stalker,” The Moscow PD said in an update on the investigation on Tuesday night. “They have pursued hundreds of pieces of information related to this topic and have not been able to verify or identify a stalker.”

Clemente thinks authorities have a lot working against them because in addition to the offender likely fleeing town after the killing — and getting a nine hour head start before the alarm was raised — students also followed suit, out of fear or for Thanksgiving break. 

“That’s a big problem,” he said, because potential suspects and witnesses are now gone.

Still, locals should be on the lookout for people who stopped coming to work following the murders or changed their behavior drastically, he said.

“Somebody in this community knows him,” he insisted.