A patient at St Andrews Hospice in Grimsby has told the Duchess of Cambridge she was waiting for her to become Queen.
Kate replied: "You'll be waiting an awfully long time."
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Mladic, now 75, was the military commander of Bosnian Serb forces in the 1990s, who fought against the Bosnian Croat and Bosniak armies.
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His representatives said Cassidy, who was hospitalised last week, died "surrounded by those he loved."