CBS/AP BERLIN – He was the lovely of Berlin, an international superstar, a triumph story of beating the odds. And right now Knut, the five-year-old polar bear who spent his full life raised by humans, is over.The cause of death is unknown. Pictures: Nuts above KnutThe Berlin Zoos bear-curator, Heiner Klos, thought with the purpose of Knut was found hovering hip the dampen hip his cage.Knut happening life in the field of the Berlin Zoo, the primary polar bear born in attendance in the field of thirty years. on behalf of unknown reasons, the cub was abandoned by his tend, and was raised by his instructor Thomas Dorflein.