Abstract: On February 16, 2005, Employee #1 was conducting a survey of the existing buildings at the old Byberry State Hospital with a coworker. The survey was being conducted so the employer could bid on the environmental remediation and demolition of the buildings. These buildings were not occupied or maintained for over 25 years. While they surveyed a building (N7, W7) which was four stories high, the two employees proceeded to walk to the stairway on the third floor so that they could reach the second floor. When Employee #1 stepped onto the stairway, he fell through the steps because they were structurally unsound, having been .neglected for many years. Employee #1 hit the stairway below and continued to fall through the stairway and landed on the first floor stairway landing. Employee #1 sustained severe head injuries and was pronounced dead at the scene. Maintenance of the stairways had been neglected for many years.