Why would anyone want to kill family man John Reynolds? He lived in Rushden, Northamptonshire, and was gunned down early in the morning on Monday 18 October as he walked his dog in a quiet country lane. His death is still a mystery, but perhaps you hold the vital clue to his killing. Police urgently need to trace the motorcyclist seen at the scene moments after the murder. Maybe you've seen the distinctive motorcycle before, or can recognise the man who rode it?

In Shropshire, two security guards were attacked and subjected to a terrifying ordeal as they tried to make a delivery on 21 September. Police need your help to identify four men they believe were involved in the raid. Locals recall seeing strangers in the town about a month before the attack, and Crimewatch has impressions of their faces and descriptions of their getaway cars in the hope you might remember something.