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WASHINGTON (WUSA9) -- We have some sad news out of the National Zoo. A six-year-old male brown kiwi named Koa was found dead in his exhibit at the Bird House on April 26.

Zoo officials say Koa died unexpectedly. A necropsy indicated he had a form of cardiac disease. Koa did not show any warning signs of clinical illness.

Koa was a demonstration animal who participated in "Meet a Kiwi" demonstrations three times a week. During the demonstrations, visitors could see Koa up close.

Hatched March 7, 2008, Koa was the third brown kiwi to hatch at the Zoo. Koa's father Maori and mother Nessus hatched six chicks from February 2006 to March 2012. The Zoo has seven kiwi in its collection.

Zoo officials say further investigations will yield additional information on the type and other details of this cardiac disease.

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