Six Flags Over Georgia plans to reopen Friday as state officials investigate the death of Hassan Kariem, 42, who fell from the Goliath roller coaster Monday afternoon. The Georgia Office of the Commissioner of Insurance and Safety Fire, which oversees amusement-park inspections, is investigating the circumstances of the fall. No cause has been established. Investigators are expected to examine the ride, interview witnesses and review maintenance and operating procedures, said Robert Niles, editor of ThemeParkInsider.com and a longtime amusement-industry observer. He said the incident appeared highly unusual, but cautioned that the investigation must determine what happened before conclusions can be drawn. Bolliger & Mabillard, the company that manufactured Goliath, said it is investigating and would not comment further while more information is gathered. The company said it was saddened by the death and expressed sympathy for Kariem’s family and others affected. The fatality may renew debate about whether roller coasters should use additional restraints, such as seat belts alongside lap restraints. Niles said some rides, including Goliath, do not use those added restraints, and that design and boarding decisions can involve trade-offs, including loading time. Whether any restraint or other safety issue played a role in this incident remains unknown. The International Association of Amusement Parks and Attractions has reported fewer than two injuries for every 1 million roller-coaster rides. Its figures attribute about 9% of injuries to operational factors and 15% to technical factors. Those industry-wide statistics do not establish what caused Kariem’s fall. Attorney Aura Taylor said responsibility cannot be assessed until investigators establish the facts. The findings could inform any decisions about safety practices, but officials have not announced a timeline for the investigation.