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When I saw the programmes, they didn't explain how the drawing came about. I got the imprssion that the police just asked for "witnesses" – to what? – and somebody came forward to describe a man they had seen at an ATM. Sunk's explanation makes sense, though I don't know if it's what actually happened. Although the Bullseye tape established that Cooper was lying (or mistaken/forgetful) when he said he'd never had shoulder length hair, I didn't see that it was so important in proving Cooper was Dixon's killer. Yes, the sketch looked quite a bit like Cooper on Bullseye, it wasn't exactly a photographic likeness. The Dixon murders were in 1989, the cold case review began in 2006. I don't know when Cooper was interviewed, but could you remember the way you had your hair 17 years or more ago? I think that the DNA evidence that linked the shorts found at his home with the Dixons was much more important.