'Ted Bundy and Gainsville Ripper didn't stop': Criminal profiler warns Idaho murderer could kill again

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Danny Rolling, also known as the Gainesville Ripper, slaughtered five students in Gainesville, Florida, over four days in August 1990. He later murdered three other people in his home town of Shreveport, Louisiana. He also tried to kill his own father. 

Similarly, the Idaho killer allegedly broke into the student house and killed the four students, making their way to three separate bedrooms in the three-story house. In the early morning hours of November 13, Kaylee Goncalves, 21, Madison Mogen, 21, Xana Kernodle, 20, and Ethan Chapin, 20, were stabbed to death in an off-campus rented home. Law enforcement has yet to identify the suspect(s) in the case. Authorities have said that the gory scene where the students were killed was the “worst they’ve ever seen." 

Kelly, who has worked on more than 100 serial murder cases, told Express that "History tells us that mass murderers such as the Gainsville Ripper, Danny Rolling, Ted Bundy" killed again after initial victims. Kelly said the killer knew what they were doing to not wake up the two roommates who survived -- Dylan Mortensen and Bethany Funke, both 19.

"Usually in the killers, I've researched, usually they work their way up to killing one or two people," he said, adding that he believes the killer may have either killed before or had "some know-how about what they were doing". He suggested that "they been so young and naive that they thought they could take four people out at once or that they have killed before and have a lot of confidence that they can do something like this".

Kelly has personally worked with serial killers. He urged university students who have returned to campus after Thanksgiving to stay vigilant. "I think it's very important that until this person is identified, the students have to be on their toes at university. We don't know if this guy has quenched his bloody thirst," he said. "We know Ted Bundy didn't stop and we know the Gainsville Ripper didn't stop."