He claimed he panicked after she became unresponsive, called a friend with a boat, and decided to dump the body in a spot that is known to have off-shore currents and lots of sharks. My brother-in-law said that that spot is well known by the criminal element on the island for exactly that purpose....they suspected this exact scenario right from the start but were unable to find any evidence.
Under local law, you cannot be convicted on just a confession without corroborating hard evidence, so there is a good chance is still will get away with it if they are not able to come up with that.