FARMINGTON -- A Franklin County grand jury Tuesday found enough evidence against a Wilton man to indict him on a manslaughter charge in connection with a crash in July that killed a 73-year-old woman.

Richard Greco, 59, of Wilton, was also indicted on two counts of operating under the influence of alcohol or drugs and causing serious bodily harm.

The head-on collision killed Avis Pettingill, of Jay, and seriously injured four of her family members on U.S. Route 2 in Wilton on March 27.

Pettingill was in the front passenger seat of a 1998 GMC Yukon sport utility vehicle being driven by her grandson, Shawn Hiscock, 29, of Jay.

Hiscock's wife, Heather, 30, who was pregnant, was seated in the rear between their children, Jordan, 8, and Isaac, 2, who were both secured in child-safety seats. All the adults in the car were wearing seatbelts, according to Wilton police.

Due to the seriousness of their injuries, Shawn and Heather Hiscock and both children were flown to Central Maine Medical Center in Lewiston. They continue to be treated for medical issues as they recuperate and the children suffer from emotional trauma as a result of the collision, Assistant District Attorney James Andrews said Tuesday.

According to Wilton police at the time, Hiscock and his family were taking Pettingill to a doctor's appointment in Farmington when Greco's westbound truck crossed the yellow line and slammed into the SUV about 300 feet east of the intersection with Route 156.

Andrews said a toxicology analysis of Greco's blood sample taken after the crash indicated he was under the influence of prescription medications. He suffered minor injuries and was treated at Franklin Memorial Hospital in Farmington and released the same day.

Andrews said the investigation into the case has been extensive.

"We subpoenaed his medical records that indicate a history of drug use and many witnesses have been interviewed," he said.

An indictment is not a determination of guilt but a formal accusation charging a person with a crime, indicating that a grand jury finds there is sufficient evidence to take the case to court.

Betty Jespersen -- 778-6991

bjespersen@centralmaine.com