A tree worker has been electrocuted in Wilton.  Police responded to Ruscoe Road yesterday evening on a report of a 25-year old man who was unresponsive.  The Stamford man was working with a tree crew from M. Lato Tree Company. A preliminary investigation determined that the boom on the truck had come in contact with the power lines.  The victim opened the door of the then energized truck and was shocked.  He was transported to Norwalk Hospital, where he remains in critical condition with life threatening injuries. The incident remains under investigation by Wilton police and OSHA.