The world's most prolific killer, Shipman is estimated to have killed 275 people, but the actual figure will never be known. The 57-year-old GP was given 15 life sentences to run concurrently for the murders, and four years for forging a will, but hung himself in his call after he was sentenced. He always denied his crimes. When the police began investigating Dr. Harold Shipman an September 1998 they struggled to understand him. How could a GP who was trusted and respected by more than 3,000 patients also be a killer who struck after time with no obvious motive? The coroner speculated that 'the only valid possible explanation for it is that he simple enjoyed viewing the process of dying and enjoyed the feeling of control over life and death, literally over life and death...'