\u201cIt is like opening Pandora\u2019s box, because you want to know everything about that victim - who would want to kill her. Why? Why did this happen?\u201d - Detective Chief Inspector Maria Woodall, Senior Investigating Officer, Surrey Police. ITV's latest Crime and Punishment documentary series sees Susanna Reid investigate the murder of Sharon Birchwood - a modern day murder-mystery which left police officers and detectives bemused. Taking those investigating the murder from the otherwise picturesque country roads of Surrey to the backstreets of Thailand, the killing - which took place on December 4th 2007 - is explored for the first time since the case was closed 8 years ago. Reid interviews those who were closest to the case including key members of the police investigation team and looks through never before seen case files in a bid to understand the crime, equally as baffling as it was heinous. Who Killed Sharon Birchwood - Thursday 9:00pm on ITV.