WHITE RIVER JUNCTION — A 47-year-old Vermont woman will plead guilty to driving drunk when her vehicle crashed on Interstate 89 in Sharon, killing her 11-year-old son and injuring other family members.

Dawn Baustert, of Essex Junction, Vt., will plead guilty to a single count of driving under the influence with a resulting fatality and receive a one to five year prison sentence, all suspended except for 15 days to serve, and eight years probation, according to a plea agreement filed in Windsor County Superior Court.

Three other felony charges and one misdemeanor charge will be dismissed.

Under the plea agreement, Baustert will be subject to special conditions including a prohibition on consuming alcohol, completion of an impaired driver rehabilitation program and consent to an interlock device — which connects a breath analyzer to a motor vehicle’s ignition system — on her vehicle for the first three months of her probation if her driver’s license is reinstated, court documents show.

Brian Marsicovetere, a White River Junction attorney representing Baustert, said via email that his client would have “no comment at this time.”

Baustert was at the wheel of a Chevrolet Suburban on the way to Boston with her husband, Timothy Baustert, a 15-year-old girl and the boy when it crashed into rock ledges in the snow-covered median along the southbound lanes of Interstate 89 in Sharon on the afternoon of Nov. 17, 2022, according to police.

When emergency crews arrived at the scene at 3:22 p.m. they found the boy dead in the backseat behind the driver’s side and Baustert trapped behind the steering wheel with injuries, according to the police affidavit filed in support of the charges.

Crash team investigators found that the deceased juvenile had been “improperly restrained in the vehicle with only a lap belt restraint being used” and the shoulder belt was “behind the juvenile’s body against the back seat,” the affidavit says.

They determined the child had been killed by blunt trauma to the neck, torso and extremities.

When police asked Timothy Baustert at the scene to explain what had occurred, he said they had left their house at about 2:10 p.m. earlier that afternoon.

“I fell asleep, she fell asleep,” explained Timothy Baustert, according to the affidavit.

Police found in the vehicle six unopened “5ml nips” containing various liquors in a handbag. Tests done on samples of Baustert’s blood found they exceeded legal blood alcohol concentration levels.

Investigators also determined, citing the vehicle’s event data recorder, that the Suburban was traveling at a speed of between 77 miles per hour and 83 miles per hour in the seconds before the impact.

The teen girl suffered fractures to her right leg, right ankle and right foot, the report said.

Police said the weather was clear and highway road conditions were dry at the time of the crash.

Contact John Lippman at jlippman@vnews.com.