Abstract: On March 30, 2007, an employee and a coworker were on a flat roof installing new air conditioning units. The units had been installed onto the roof the previous day, and the employee and the coworker were installing the wiring and other related work. The employee was unrolling thermostat wire from a spool. As the wire came off the spool, the employee walked backwards. As he walked backwards, he either stepped onto or was tripped by the edge of a skylight plastic cover. He fell backwards through the plastic cover, and fell approximately 34 feet onto the concrete floor of the building. His head and shoulders initially struck the floor. He died at the scene from his injuries.