The polar bear, who was raised by humans in the Berlin Zoo after being rejected by his mother, was once so famous he graced the cover of Vanity Fair.
FORBES: Why Knut The Bear Is Like Lindsay Lohan
Richardson said that that much of the criticism of Berlin Zoo - such as over their merchandising policy - was unjustified.
BBC: Knut: A polar bear story
And if a zoo is treating the bear well - as he believes Berlin Zoo was with Knut - then keeping some in captivity is a price worth paying.
As his fame grew, a row over the royalties from the bear's popularity erupted between Berlin Zoo and Neumuenster Zoo, where he was born.
BBC: Star German polar bear Knut dies
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