Knut died while sunbathing at Berlin zoo in Germany in front of visitors.
BBC: Candles by Knut's enclosure
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
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
Eventually Berlin Zoo agreed to pay 430, 000 euros to compensate Neumuenster.
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.
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
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