Police say Christopher Halliwell could be a serial killer

Police fear Christopher Halliwell - the murderer of Becky Godden and Sian O'Callaghan - may have killed more women. Officers have taken several calls since the former taxi driver's trial began and are appealing for anyone with information to come forward. The jury in his trial for murdering Becky Godden was not told of the account of Ernest Springer, an inmate at HMP Dartmoor who spent time inside with Halliwell in 1986.