A male nurse dubbed the 'Angel of Death' has today lost a last-ditch bid to overturn his convictions for the murder of four elderly women and the attempted murder of a fifth – in a chilling case that bears haunting similarities to baby killer Lucy Letby.

Colin Campbell, formerly known as Colin Norris, was jailed for life in 2008 after a jury found him guilty of murdering Doris Ludlam, Bridget Bourke, Irene Crookes and Ethel Hall – all patients on orthopaedic wards in Leeds in 2002.

The former nurse was also convicted of attempting to kill another patient. All of his victims developed sudden, unexplained hypoglycaemia – dangerously low blood sugar – which prosecutors at the time argued could only have been induced.

Campbell, now in his late 40s, has always maintained his innocence and denied any wrongdoing. He has repeatedly insisted he did nothing to cause hypoglycaemia in any of the patients.

But after a 14-day hearing earlier this year, the Court of Appeal dismissed his latest legal challenge – ruling that his five convictions were safe.