Pitchfork: Time of horrific crimes and multiple parole attempts

November 21, 1983: Lynda Mann, 15, found raped and murdered near Black Pad footpath, Narborough.

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February 2, 1984: Lynda buried at All Saints' Church, Narborough.

Summer 1984: The murder investigation team is scaled down.

September 1984: Alec Jeffreys, of the University of Leicester, discovers genetic fingerprinting.

July 31, 1986: Dawn Ashworth, 15, is raped and murdered in Ten Pound Lane, Narborough.

August 1986: A 17-year-old is arrested in his Narborough home.

September 1986: Dawn Ashworth is buried at St John the Baptist Church in Enderby. Prof Jeffreys analyses DNA samples that prove the arrested teenager could not have been the killer.

January 1987: Police take blood or saliva samples from more than 4,000 men with links to the villages. A worried Pitchfork gets a gullible colleague at Hampshire's Bakery to take the test for him.