My then husband, a detective chief superintendent, appeared on "Crimewatch" to appeal for information in the unsolved 1987 murder of private detective Daniel Morgan, whose business partner Jonathan Rees was alleged to have supplied News of the World's parent company News International with illegally obtained information.

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The Lord Lieutenant of Gwynedd, Huw Morgan Daniel, who is the Queen's representative in Gwynedd and Anglesey, said he was "delighted" by the announcement of the engagement.

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Samantha Rigg-David, the sister of Sean Rigg, a 40-year-old man who died in police custody in 2008 in Brixton, and Alastair Morgan, whose brother Daniel - a private detective - was found with an axe in his head in a south London pub's car park in 1987, took part in the demonstration.

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