A 33-year-old man was found face down in a shallow pond Monday morning behind a Fernandina Beach home, according to the Nassau County Sheriff's Office.

Deputies said the death was accidental. They said the man, whose identity was not immediately released, was found in water about 18 inches deep in a pond on Philips Manor Road in Fernandina Beach.

Investigators believe the man slipped and struck his head.

The cause of death is pending an autopsy.