SKOWHEGAN, Maine — The trial of a Norridgewock man accused of killing Everett L. Cameron more than three years ago will begin later this month.

Robert Lee Nelson, 41, is charged with intentional or knowing murder in the death of 60-year-old Cameron of Anson on Oct. 31, 2009.

Nelson pleaded not guilty to the charge on Oct. 6, 2011, in Somerset County Superior Court in Skowhegan.

According to Maine Department of Public Safety spokesman Stephen McCausland, Cameron was shot to death while sitting in his pickup truck a short distance from his Town Farm Road home.

The Somerset County grand jury indicted Nelson on Sept. 16, 2011, nearly two years after the slaying. Nelson was already being held in Somerset County Jail in Madison on an unrelated charge when he was formally charged by police with Cameron’s murder.

On Nov. 6, Nelson waived his right to a jury trial, and instead the case will be heard by Superior Court Justice John Nivison.

Brenda Kielty, spokeswoman for the Maine attorney general’s office, said Wednesday that the trial will start on Monday, Nov. 26, in Somerset County Superior Court and is expected to last six days.

The state has 48 people on its witness list, including 10 members of the Maine State Police, two deputies with the Somerset County Sheriff’s Department, Chief Medical Examiner Dr. Margaret Greenwald, Maine State Crime Laboratory Senior Laboratory Scientist Kimberly Stevens and 34 civilians.

Skowhegan attorneys Philip Mohlar and John Alsop are working as co-counsels for Nelson.

“It’s primarily a circumstantial evidence case,” said Mohlar on Wednesday afternoon. “My guy has steadfastly maintained his innocence right from day one.”

In a motion filed with the court, the prosecution said it anticipates that Virginia Hayden, the victim’s fiancée, and Everett J. Cameron Sr., the victim’s son, will testify that they were each told on the morning of the murder by Everett L. Cameron that he had plans to meet Nelson that afternoon.

Cameron spent the first part of Oct. 31, 2009, hunting. He returned home in the early afternoon and changed out of his hunting clothes, investigators said shortly after the shooting.

At some point, he drove his 1990 silver-and-maroon Chevrolet pickup truck to a woods road adjacent to his home and parked about 20 feet from the road. Cameron’s girlfriend found his body about 4 p.m. that day.

“Detectives have investigated the death over the past two years and say the two men did know each other,” McCausland said in a press release after Nelson was indicted last year.

In addition to Class A murder, Nelson is also charged with Class C possession of a firearm by a prohibited person.

Nelson also pleaded not guilty to that charge last year.

He is prohibited from having a firearm because he was convicted in Penobscot County Superior Court on Oct. 4, 1994, for burglarizing a motor vehicle.