GARDINER — A Gardiner man was killed in a single-vehicle accident Wednesday on Marston Road.

Kenneth Wilson, 56, was discovered by a passer-by, unconscious in a 1996 Volvo sedan, which had rolled over on Marston Road, according to police Chief James Toman.

Wilson was the car’s driver and lone occupant. He was dead at the scene, Toman said.

The passer-by who came across the crashed car called 911 at 4:04 p.m.

In addition to police, Gardiner Fire and Emergency Medical Services went to the accident scene.

Toman said the investigation is ongoing, but preliminarily, it appeared Wilson was traveling north on Marston Road, headed toward U.S. Route 201, when he possibly suffered a medical problem that caused him to crash into a tree, which caused the Volvo to roll over and land on its roof.