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“IT is by any measure an extraordinary drama.”

Prof Sir Alec Jeffreys talking to me about Code of a Killer, a heartbreaking, powerful and brilliant TV production written by Michael Crompton.

Revealing the story of how DNA fingerprinting was discovered and then used in a double murder investigation.

It was a real honour to be asked to write the ITV interviews for this moving 2 x 90 minute drama, which begins at 9pm on Easter Monday.

Including an unforgettable day in the very same laboratory at Leicester University where Sir Alec experienced that ‘Eureka Moment’ on September 10 1984.