Abstract: A three-person crew was painting a rig derrick/mast that had been removed from its rig floor and placed horizontally on two stands. The crew was lowering the diving board to its storage/resting position, when the diving board section started to jam up and would not lower to its storage/resting position. Employee #1 was trying to get the back wind wall unjammed, when the board fingers pinched his head against the back wind wall, crushing his head. It appeared as though the cable associated with the wench being used to lower the boards had some slack in the line, and, when Employee #1 freed the wind wall, the board fell into its resting position, pinching the employees head between the fingers and the wind wall. Employee #1 was killed.