Abstract: On April 23, 2007, a work crew was renovating and adding additional support to a power generation plant heater that was being converted from a pressurized system to a negative pressure vessel, which was 110 feet above ground level. There were 5 stages of scaffold that the work crew was using for renovating the roof area of the heater by torch cutting and removing sheeting and metal stiffeners. Employee #1 was walking on a parapet wall with railing when he tripped, lost his footing and fell. The fall was unwitnessed. Employee #1 tried to grab onto a 10- in. pipe, but continued to fall about 30 feet. He struck a 2-in. metal pipe railing on the lower roof, and then fell another 17 feet to the ground. He was not wearing any fall protection. When Employee #1 did not return from his break, his coworkers went to look for him. He was located in an area of open space between buildings in a 4-ft by 4-ft section, and could only be seen from above. He was transported to the local area hospital where he was pronounced dead.