Abstract: At approximately 4:00 p.m. on August 6, 2007, Employee #1, a boilermaker, was cutting a catwalk grating that was sitting on 31 ft high channels. Earlier that morning, one end of this grating and channel had been cut and removed. Employee #1 was standing on this section while cutting the next section. When he finished cutting the grating completely through, the channel and grating gave way. They fell, along with Employee #1, to the next level of the catwalk. He landed on some debris, fell to one side, and then struck the top guardrail. Employee #1 was killed. When the channel was later lowered for inspection, it was found that the previous welding was porous, rusted, and lacked penetration. At the time of the accident, Employee #1 was wearing a harness and lanyard but he was not tied off.