The giant fish was actually only "a teenager", and the cause of his death was not able to be determined.
Ralph arrived at the aquarium in 2005 from Taiwan, and he and Norton - another male whale shark - arrived at the same time. They were joined a year later by two females of the species, called Alice and Trixie.
The Georgia Aquarium is said to be the largest in the world and houses more than 100,000 specimens.
Whale sharks are the largest fish found anywhere in the world and can grow up to an incredible 50ft in length.
