Many news articles and reports are in conflict of what truly happened from reports of her slipping into the water to Tilikum grabbing Dawn and pulling her in. All we know is that she drowned not long after entering the water with him.
Sea World have closed its park and stopped its 'Shamu' show in all its other parks as investigations are carried out into this incident.
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Keep an eye on the major news channels e.g. CNN and Sky for the latest news.