BELFAST, Maine — A man involved in a head-on crash on Route 1A last March that caused serious injuries to a woman has pleaded guilty to charges stemming from the accident and will be sentenced in March.

William Hinkle Jr., 35, of Frankfort, pleaded guilty last week to aggravated driving to endanger and to operating under the influence.

According to documents filed at Waldo County Superior Court in Belfast, he also pleaded guilty to unlawful trafficking in marijuana and possession of cocaine.

Hinkle had been attempting to pass another vehicle in his Chevrolet Blazer in Frankfort on March 23 when he crashed into a Subaru Legacy driven by 59-year-old Louise Boudreau-Bouchard of Searsport.

She suffered extensive injuries and had to be cut out of her crumpled vehicle before being airlifted to Eastern Maine Medical Center in Bangor.

Other media outlets have said that Boudreau-Bouchard lost part of her hand after the crash, but police and Waldo County Deputy District Attorney Eric Walker have been unable to verify the report.

Eyewitnesses told officers in March that they thought Hinkle had been driving too fast when he pulled out to pass the car. At the accident scene, police observed marijuana in Hinkle’s vehicle. They searched his home and found cocaine residue there, according to police reports.

Hinkle is scheduled to be sentenced at 1 p.m. on Friday, March 2. His attorney is Peter Baldacci of Bangor.