Abstract: At approximately 11:00 a.m. on March 23, 1998, Employee #1 and three coworkers were repairing damaged portions of a 200 ft wide by 250 ft long by 20 ft high warehouse roof. Employee #1 was using a masonry power saw to cut the damaged roof pieces into 2 ft by 3 ft sections to facilitate their removal. His coworkers were responsible for removing the 3 ft sections and replacing them with new material. Earlier, the crew had cut and removed a section of the roof north of where they were now working; however, the section had not been replaced. Employee #1 resumed cutting the roof and was walking backward when he stepped through the unguarded roof opening and fell approximately 20 ft onto a concrete floor. Employee #1 sustained a compound fracture to his leg and head trauma, from which he died.