A man from Sidney was killed Friday in a dump truck accident. According to New York State Police,  66 year old William Barse was hauling stone on a Quarry Access Road, off State Route 8 near Mills Road, in the Town of Deposit when he drove off the road several times, striking trees, overturning the truck and then coming to rest in the road. Barse was ejected from the truck and pronounced dead at the scene. New York State Police are continuing the accident investigation.