Abstract: On June 23, 2011, Employee #1, an ironworker, was installing a structural steel bracing and painting structural steel beams in the ceiling of a manufacturing plant addition. Employee #1 was working alone from a boom-supported aerial work platform that was borrowed from another employer. At approximately 11:15 am, an electrician walked into the area and found the aerial work platform elevated with Employee #1 slumped over the controls. Employee #1 was crushed between the work platform and one of the ceiling beams. Other tradesmen at the worksite used the ground controls to lower Employee #1 to the floor. Employee #1 died from the injuries. Employee #1 had been trained in operating a boom-supported aerial work platform by his employer, but was not trained in the differences between those aerial work platforms that were owned by the employer and the borrowed lift being used the morning of the incident. The drive controls on the borrowed aerial work platform may have been reversed from the actual direction that they would operate.