On June 2, 2010 Derrick Bird, a 52 year-old Cumbrian cab driver, went on a killing spree, shooting dead 12 people and injuring 11 more. His motivation is still unclear; an argument with colleagues, a family feud, and a previous assault are all said to have possibly tipped the divorced grandfather and father over the edge.Beginning in the early hours of Wednesday morning with the murder of his twin brother David and the family solicitor, Kevin Commons, Derrick then drove to Whitehaven, opening fire at 10:35am andkilling two of his colleagues. He then went ona rampage through the villages of...