ALTOONA, Iowa (AP) – An Iowa agency has proposed fining Adventureland park after an investigation prompted by the June death of a worker at the theme park. Officials have said Steve Booher was fatally injured June 7 when the Raging River ride started unexpectedly as he was helping people off.

The Des Moines Register reports that the Iowa Occupational Safety and Health Administration has fined the Altoona park $4,500. The park has 15 days to contest the agency’s findings.  A day after the accident state inspectors reported finding found no safety defects. But after a lengthy investigation, Iowa OSHA determined that Adventureland should install devices to ensure that ride assistants are positioned safely before ride operators let the boats advance.