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The drowned man and GPS that cracked this mysterious case - Robbie Coltrane's Critical Evidence


Robbie Coltrane takes a look at the case of Canadian banker Albert Walker, who assumed the identity of his business partner after murdering him. Robbie Coltrane reveals eight of the hardest, most complex and baffling murder cases ever to be investigated by British police. The focus of each programme is the trail of evidence: how it was discovered, what it meant and how it became critical to crack the case. With interviews from the lead investigators and forensic specialists, many speaking for the first time, Robbie reveals the astonishing twists and turns of often stranger-than-fiction cases.