Police say a crew from Precision Tree Service, a local landscaping company, was at the private home on Avery Hill Road to cut down two trees.
They were using an Extenda-lift boom truck which has a base with four wheels, an arm that extends out about 40-feet, and a counterweight on the base.
The workers had just cut one tree limb and swiveled the arm to get to another limb when the truck went out of balance and fell over. When the arm came down it hit power lines and the house throwing the two men from the bucket at the end of the extended arm.
A 33-year-old man was transported to The William Backus Hospital in Norwich by ambulance with minor injuries.
The 54-year-old man, who is the owner of the company, was unconscious and suffered what police describe as serious to critical injuries, but non-life threatening. He was airlifted to Hartford Hospital by LifeStar.
Ledyard police are calling this a tragic accident. Ledyard police and OSHA, the Occupational Safety and Health Administration, are investigating.