Abstract: At approximately 1:00 p.m. on July 5, 2007, Employee #1 was on crew of five, including the supervisor, that was installing three boom-gates on a 300 ft tall telecommunication tower under construction. Using a cathead to hoist the booms, they successfully installed the first boom. Employee #1 rigged the hoist line by connecting a snatch block to the top flange of the southwest tower leg, connecting a carabiner through a bolt hole on the flange and finally connecting the load hook of the snatch block to the carabiner. The crew then moved on to the second boom. It had been lifted to the highest point allowed by the rigging configuration and Employee #1 radioed to the hoist operator to stop. To get the boom to the required installation location, Employee #1 had to use a come-along to lift it another 5 to 6 ft. Before he could connect the boom to the come-a-long, the carabiner broke and the boom struck Employee #1 on the head, neck, and shoulder, nearly severing his right arm. He did not lose consciousness, and two coworkers on the tower tied Employee #1's arm in place and helped him climb down nearly 300 ft. He was transported by ambulance to a local hospital and then transferred to University Medical Center in Jackson, MS. He died two days later of head injuries sustained in the accident.