A blood-stained sock links a man convicted of murdering four members of a family to the scene of the crimes, forensic evidence found during a new review shows. David “Dai” Morris – who died in prison in August aged 59 – had been found guilty at two trials in the 2000s of murdering Mandy Power, 34, who he had been in a relationship with. He was also convicted of bludgeoning to death her two...