Police are continuing to search the site of where a man was found stabbed to death in Durham.
Peter Thomas Maine, 56, was found dead near a river at the Maiden Castle Sports Complex on Sunday morning.
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Sandiford, a former legal secretary originally from Redcar, was convicted of drug smuggling offences and sentenced to death in 2013.
Durham Crown Court heard that one of the male victims suffered a triple-fractured jaw, while left lying in the gutter, unconscious.