After spending more than 30 years cruising some of America’s emptiest roads as a long-haul trucker, Samuel Legg is now is suspected of killing at least four women at truck stops in Ohio and Illinois.

Legg, who has been charged in the death of 43-year-old Sharon Kedzierski, who was found at the Universal Truck Mall & Flea Market rest stop in 1992, is suspected of being a serial killer.

“I think it’s fair to say we may have a serial killer on our hands,” Ohio Attorney General Dave Yost told The Daily Beast. “He’s been linked with multiple unrelated homicides in multiple locations, which is what a serial killer is.”

Police were able to connect Legg’s case to Kedzierski using DNA from a family member during an investigation into a 1997 rape. Using his brother’s DNA, police were able to link Legg to the scene of the rape and, after issuing a warrant for his DNA, the killing of Kedzierski.

“Legg has a brother who had been convicted of a completely unrelated crime, so his DNA was already in the database,” Yost said.

Though details have yet to be released because charges haven’t been filed, the Ohio Attorney General office says Legg’s DNA is also linked to three other homicides.

Legg has pleaded not guilty to both the 1997 rape and Kedzierski’s murder.