Abstract: At 7:30 a.m., Employee #1, a roustabout with 5 to 6 years experience, was lowering a 8 5/8 in. mud suction line into an open well-site mud pit with a hand winch when the operator engaged the mud pump clutch, forcing the relief valve to open. The line valves directing the circulation of the mud were closed. The discharge line from the relief valve was in a horizontal position, allowing the pressured mud to discharge from the relief valve, and/or the winch's spinning handle, straight at Employee #1. The liquid punctured his chest, killing him. There was no autopsy or investigation by law enforcement agencies. There were no work procedures to prevent the accident.