Nurse Colin Norris was jailed for 30 years for killing four elderly women patients in 2008.
Compelling new evidence suggests not only that Colin, who was dubbed The Angel of Death, could be innocent, it also hints that his victims in two Leeds hospitals were not murdered at all but died of natural causes.
The fresh evidence unearthed by May and Shorter is now being actively pursued by the Criminal Cases Review Commission, which has the power to refer the case back for a further appeal.
A Jury Blinded By Science: The Case Of Colin Norris is published by Inside Justice.
Colin's mother joins us in the studio.