The four students' murders were the subject of an arrest.
A source told the Daily Mail that the victims' phones were tracked before they were killed.
The local brewery owner told NBC that he was known to be "creepy" to women.
The suspect in the murders of four Idaho college students may have had links to his alleged victims.
A man who is currently in a Pennsylvania jail has been charged with murder in the deaths of four University of Idaho students. The bodies of five people were found in their home over a month ago by two of their roommates.
The Washington State University criminal justice graduate student, who lives just miles from the crime scene, was connected to the killings through his car's genetic material.
The suspect is said to have tracked the four victims' phones for weeks before they were killed. The police haven't confirmed the details.
The source told the Mail that a Pennsylvania police officer was one of the people who followed him after the killings.
Jordan Serulneck told NBC that the suspect was "creepy" toward women before. He got a master's degree from DeSales University last year and was a patron at Serulneck's brewery.
Female employees and customers complained that he was harassing them. He would get angry when they didn't reply when he asked where they lived.
One of the employees was called a bitch by the man.
He studied the emotions of people committing crimes when he was a student at DeSales. According to Jordan, it seems that the man was obsessed with crime.
She told the network that from the beginning they knew this was an organized killer.
Business Insider has an article on it.