The incident occurred at Kishkinta Theme park near suburban Tambaram yesterday when the ride crashed while being tested, police said.
The park's proprietor Jose Kunus and Manager Sakthivel were arrested on charge of negligence, police said.
The victim, identified as Mani, was declared brought dead at a hospital.
The nine persons were treated for injuries.
Police said the incident occurred after the park was closed and its cause was being investigated.
An employee only said that the theme park, a popular water sport spot, was closed today.
