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Analysis of text messages reveal a husband's plot to cover up his wife's murder and traces of DNA on decades old evidence helps bring justice to the family of a murdered woman.
Pollen and bone experts help identify the remains of a murder victim found in a sports bag. And advances in DNA help find the killer of a Bradford pensioner after 22 years.
How expert analysis of nettles and chalky soil helped catch the killer of Soham schoolgirls and how advances in DNA techniques finally solve the murder known as Beauty in the Bath