<p>Cause of death: Drowning…due to collapsing into his pool of water because his brain had swelled.</p>
<p>[BBC</a> News - Polar bear Knut died of drowning in Berlin Zoo](<a href=“http://www.bbc.co.uk/news/world-europe-12939434]BBC”>Polar bear Knut died of drowning in Berlin Zoo - BBC News)</p>