Police are appealing for help to find out more about the movements of John Roberts from Winlaton prior to his death.
The 32-year-old was found dead in Gateshead this morning with serious head injuries.
Police are asking for anyone with information to come forward.
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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.