New evidence leads to review of Norris murder conviction

In 2008 Colin Norris was found guilty of murdering four elderly patients in hospital in Leeds and attempting to murder another and was sentenced to a minimum of 30 years in prison.

Norris, 37, a nurse from Glasgow has always protested his innocence.

BBC Panorama has seen new scientific evidence which suggests that he could be the victim of a miscarriage of justice.

Mark Daly reports.