Abstract: Employee #1 was plastering the final section of a two-story apartment building. He had been told by the supervisor to fix the patio light receptacle, which was at a height of 18 ft on the west wall of the building. The supervisor specifically instructed Employee #1 to use two ladders to access the light fixture: a 28 ft extension ladder to reach the projecting patio, and a portable 6 ft A-frame wooden ladder to pitch on the patio to access the light fixture. Employee #1 fell from a height of 12 ft, either from the extension ladder or from the patio, and suffered a fractured skull and cranial bleeding. He was transported to St. Mary's Medical Center in Long Beach, CA. No form of fall protection or fall arrest system was being used.