Manhunt: Hunting Britain's Most Wanted Murderer

In June 2004, 16-year-old Liam Kelly was lured to a location in Liverpool in the early hours of one morning and shot dead. The following year, another Liverpudlian, 22-year-old mother of three, Lucy Hargreaves, was shot dead in her own home. Her partner and their 2-year-old daughter escaped after the house was set alight by leaping from a first-floor bedroom window.

For more than fifteen years, six-foot six-inch, broadly built, ginger-haired Kevin Parle has been wanted by the police for bot...