Grinning Killer: Chris Halliwell - How Many Women Do You Have to Kill to Be a Serial Killer?

In the early hours of 19 March 2011, 22-year-old Sian O’Callaghan left a nightclub in Swindon to make the half-mile journey back to her home. She was never seen alive again.
The prime suspect in her disappearance, local taxi driver Christopher Halliwell, was arrested a few days later. Seemingly an ordinary family man, in reality, Halliwell regularly visited sex workers and viewed incredibly violent...