First broadcast 6th7th January 2015.br br Three people, the Lakhanis, an Indian couple, and an employee are shot dead by a long range sniper on a garage forecourt - a seemingly motiveless crime.br br Emilia Fox - Dr. Nikki Alexanderbr David Caves - Jack Hodgsonbr Richard Lintern - Dr. Thomas Chamberlainbr Robin Berry - Markbr Paul Blackwell - Police officerbr Sian Breckin - DC Gabby Lawsonbr Martin Campbell - Alain Gontrardbr Liz Carr - Clarissa Mullerybr Phil Cheadle - Conrad Devenishbr Andrew Cooper - Joshuabr Simon Darwen - Journalistbr Simon Desborough - Hostbr Patrick Driver - Alec Smithsonbr Brian Duffy - Andrewbr Kathleen Fraser - Berthabr Sean Gilder - Jim Cloutbr Richard Herdman - Police Officerbr Veejay Kaur - Andrea Lakhanibr Stuart Laing - Martin Crossbr Sam Lathem - Duty Sergeantbr Sarah MacRae - Kate Hultonbr Leemore Marrett Jr.