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Police were called to an address in Severn Drive on Wednesday were they found the man suffering from head injuries.
The 55 year old was taken to Musgrove Park Hospital but died later.
He was attacked outside the house in Severn Drive
Police are asking anyone who was in the area between 8 and 9.30pm on Wednesday night to contact them or Crimestoppers.
They say "Detectives have confirmed the death is being treated as suspicious, pending the outcome of a post-mortem"