Abstract: A line-clearance tree trimmer, who was also a first class climber, was part of a four-person crew removing tree branches that were too close to overhead power lines. The tree trimmer was standing in the crotch of a tree and was initially properly tied off. He had cut off some limbs and thought he was finished with this tree. While the employee was still in the tree, the foreman told him to take out two more limbs that could hit the power line if they broke. The foreman pointed out the limbs, watched the tree trimmer cut the first limb, and then turned away. When he turned back, the foreman saw the tree trimmer undercutting the limb to which he was tied off. The tree trimmer had failed to reposition his safety line after the first cuts were completed. The foreman called out, but it was too late. When the limb fell, it pulled the tree trimmer out of the tree. He fell about 35 feet to the ground, sustaining a broken neck and a concussion. He died as a result of his injuries.