At the time of the accident, the victim was pertorming maintenance on struck-mounted rotary drill. The victim was attempting to remove the spindle cap from the top of the drill head while standing on the drilling deck. The victim was using a modified pipe wrench in an attempt to loosen the spindle cap using the machine's drill rotation hydraulics by reaching into the operator's compartment. As the victim activated the drill rotation lever, the wrench swung and struck him: The force of the impact knocked him against the operator's cab, denting the frame and breaking the side window while the rotating wrench pierced his abdomen. As the victim attempted to climb down an adjacent step ladder, he was observed falling to the ground and striking his head. The victim was transported to a local hospital and died later that day as a result of his injuries.