Valium might seem to be an unusual drug to give to whales in captivity, but its use on marine mammals at aquariums and rescue facilities is probably more common than you might think.
The loss is a major blow to the local Orca population.
The aquarium in Sochi has confirmed that it has acquired at least one orca from the wild as an attraction at the Olympic Games.
For killer whales, silence is golden as they hunt in complete darkness.
Documentaries like "Blackfish" have sparked worldwide debate about whether Orcas should be held in captivity and used for our entertainment. Laci looks at just how intelligent these animals are and what a life out of the ocean does to them.