Police say they have traced a vital witness as part of the investigation into the stabbing of solicitor Peter Maine.
Peter Maine had been stabbed in the chest on a footpath alongside Durham University’s Graham Sports Centre.
The 56-year-old father-of-two had been running in the area.
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The Black Cats boss has spoken to the media following his side's one nil defeat to Bournemouth which relegated them from the Premier League.
The Black Cats will play next season in the Championship after being relegated from the Premier League.