The Florida Fish and Wildlife Conservation Commission says divers from the Seminole County Sheriff's Office found the body of 36-year-old Jamie Orsten on Saturday.
Orsten was thrown into the water after the boat he was riding in crashed with another vessel on the St. Johns River Friday evening. Officials say he was not wearing a life jacket.
Commission spokeswoman Joy Hill said Orsten was an Army veteran of the Iraq war.
Charges are pending the outcome of an investigation.