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Thursday's deadly oil rig accident has captured the attention of a major governement agency. The Occuaptional Safety and Health Administration or OSHA is investigating the oil rig accident that killed a Montana man. Mountrail County authorities say 21-year-old Nathaniel Zinn, of Chinook, Montana, died Thursday afternoon, at a rig site about 11 miles south of Stanley. Sheriff Ken Halvorson says Zinn fell after removing a clamp bolt, leading to excessive gas pressure that blew apart some of the equipment. Zinn was pronounced dead at the scene. The sheriff's office and the federal Occupational Safety and Health Administration are investigating the death. OSHA area director Bruce Beelman said Zinn's death marks the 11th death of a worker in North Dakota's oil patch in the past 10 years.