A man serving life for murdering two women could be linked to six other killings, according to the former senior police officer who arrested him. Ex-detective Steve Fulcher claims Christopher Halliwell said police wanted to talk to him about eight murders. Mr Fulcher told this programme about the extraordinary moment Halliwell confessed to killing two women. But he’s now questioning whether his former force did enough to examine Halliwell’s potential links to other cases. Our home affairs correspondent Andy Davies reports.