Was the world's favourite polar bear, Knut, killed by fame?

By HARRY MOUNT and ALLAN HALL Cared: After he lost his mother Knut was looked after in the German capital by keeper Thomas Doerflein The world�s most famous polar bear is dead. Knut � who won worldwide affection after he was abandoned by his mother but was then hand-reared by zookeepers � collapsed in his enclosure in front of a crowd of 600 visitors.Scores of screaming children were among those