Abstract: On June 8, 2006, Employee #1 was working at an gas well drilling site. For three days prior to the accident, the well had been receiving gas, but it had lost circulation. That is, drilling mud was flowing into the wellbore, but there was no mud returning to the drilling mud circulating tank. The employer needed to determine height of the fluid level. So that he could do that, stands of pipe were to be "tripped out." The first five stands were tripped out uneventfully, but on the sixth stand, the rotating rubber head gasket had to be removed. Suddenly, the well "kicked" during the process. Employee #1 was struck by pressurized mud and gas when he attempted to remove the bolt from the rubber gasket of the rotating head. He sustained injuries to several parts of his body, and he was killed.