Jo Yeates: More than one killer? myView WHAT at first looked like a quick murder investigation could now go on for the long haul. Unfortunately, very often these types of murders are unsolved. In the early stages of an investigation when the police have someone who appears to be a suspect, they have a strategic decision to make as to whether to go in early, arrest that person and hope to get an admission. They would hope that any fresh forensic evidence would still be available. It takes a great deal of skill to get that decision right. The decision in the Joanna Yeates case was to act immediately on the evidence and information they had. That has not led to any person being charged. Because her body was frozen, they cannot be sure she was killed where she was found. Their only hope is from information coming in, or forensic evidence leading to a major suspect, or knocking down someone's alibi. That is why they have made such intensive searches for forensic evidence both at the flat where she lived and at the scene where her body was found. They clearly hope to be able to find some DNA, fibres and other forensic links which would tie-in somebody for the crime. It's a long process -- it can take forever to find a match if it's not already in the system. And if someone is a legitimate visitor to her premises and their DNA is found there, it doesn't