On August 11, 2002, a 42-year-old part-time laborer (the victim) was killed when the scissor lift he was operating elevated and pinned him against the header of an interior doorway. The victim had been working during a weekend performing touch-up painting at a newly constructed day care center. Around midmorning, two coworkers left the jobsite while the victim continued to work alone, using a scissor lift to access the ceiling areas of the structure. Later, between 9:30 and 10:00 pm., one of the coworkers discovered the victim located on the scissor lift platform. The lift was positioned partway through an interior doorway with the platform elevated. The victim was pinned between the top rail of the work platform and the head jamb of the doorway. The coworker exited the building and called 911 for assistance. Emergency medical service (EMS) personnel and local police responded and arrived at about 10:00 pm. The victim was pronounced dead at the scene. Later examination by the medical examiner's office revealed that the victim had been dead for several hours. NIOSH investigators concluded that to help prevent similar incidents, manufacturers of self-propelled elevating work platforms such as scissor lifts should: 1. ensure that selector switches used to change the operating mode of single lever control systems are guarded against inadvertent activation; and, 2. consider equipping them with audible alarms that provide different sounds for specific operational modes. Employers should: 1. ensure that workers are trained to recognize the hazards of operating self-propelled elevating work platforms in tight quarters; and, 2. ensure that all equipment is inspected for defects by a competent person and maintained in proper working order, including the function of all safety devices and alarm systems. And, equipment rental agencies should: ensure that machines are delivered to their customers in safe operating condition.