HARTLAND — One man died Thursday after the pickup he was driving rolled over on Athens Road and struck a tree, according to a law enforcement official.

It is not known if the man had a medical event before the crash, which was reported at 2:40 p.m., according to Mike Mitchell, chief deputy of the Somerset County Sheriff’s Office.

“It’s reported that the vehicle was headed to Athens from Hartland, with two people in it,” Mitchell said.

The driver has been identified as Matthew J. Sites, 56, of Athens, who was killed in the crash. Mitchell said the passenger in the 2002 GMC pickup was Kendall Judd, 39.

Sites was a longtime newspaper carrier for the Morning Sentinel, having worked for approximately 20 years, according to Charlene McGraw, the paper’s circulation manager.

Sharon Burrill, Sites’ district manager, said that “his professionalism, expertise, and personality touched the lives of everyone he worked with.”

“We are deeply saddened by this loss and extend our heartfelt condolences to his family, friends, and colleagues during this difficult time,” Burrill said. “Our thoughts are with them as they navigate through this period of grief.”

Mitchell said Sites apparently lost consciousness and Judd tried to get control of the vehicle, but the pickup went off the left side of the road, struck a tree and came to a rest on its roof in a private driveway. Some of the debris from the rollover struck a vehicle parked in the driveway, he said.

Judd appeared to be uninjured in the crash but was taken by ambulance to Sebasticook Valley Hospital in Pittsfield as a precaution, Mitchell said.

Sgt. Mathew Cunningham of the sheriff’s office was at the scene late Thursday afternoon and relayed information to Mitchell, including that neither occupant was wearing a seatbelt, Mitchell said.

LifeFlight helicopter was called but did not transport anyone, Mitchell said.

Mitchell said the accident is under investigation; neither speed nor alcohol is believed to be a factor in the crash.

“We don’t anticipate any charges at this point,” he said.