Judith Middleton, a spokeswoman for missing British yachtsman Sean Terry's family, said Mr Pokorny had told police his sole crewmate had jumped off the boat in a fit of anger.
But she told The Independent there were details in his story that did not "add up."
Mr Pokorny came on board the yacht as an experienced and strong diver and the family wants to know why he did not do more to rescue Sean.
He told police that Sean got angry and jumped off the boat, but that does not add up. He told police it happened at night and in bad weather but other ships in the area said the weather was fine.
The man-over-board button was not pressed and the satellite communication equipment was not used to radio for help. The family are desperate for answers.
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