Jacob Allen Bennett, 26, was arrested Thursday night, WBIR reported. He was being questioned about the killings.
Investigators have said they believe the killings were not random and the victims were targets. But they have said nothing about Bennett's possible relationship with them.
A resident of Renegade Mountain found the bodies of Rikki Danielle Jacobson, 22, Steven Presley, 17, Dominic Davis, 17, and John Lajeunesse, 16, Thursday morning. The three teenagers were students at schools in Cumberland County.
Jacobson was Davis's aunt, WBIR reported.
The station said Bennett has a long history of arrests in Florida and Tennessee.