Knut, Germany's most famous and first polar bear to be born in captivity in 30 years died on Saturday 19 March 2011. Apparently he dived into the waters in his enclosure, and the four-year-old died alone after a short spasm.
The cause of death is not yet determined, as Knut was not known to be ill. An earlier tragedy in 2008 before Knut's 2nd birthday, saw the zoo keeper Thomas Dorflein who had hand raised Knut, suddenly passed on at 44 after a heart attack. This seemed to affect Knut for several weeks with constant depression as the two had formed a strong bond.
This video shows Knut in happier days with Thomas. May they rest in peace together.