Three judges block Colin Campbell’s attempt to overturn his murder convictions at the supreme court

A nurse convicted of murdering four patients and trying to kill a fifth will not be allowed to appeal to the supreme court, judges have ruled.

Colin Campbell, 49, was jailed for life in 2008 for killing Doris Ludlam, Bridget Bourke, Irene Crookes and Ethel Hall on orthopaedic wards in hospitals in Leeds.

The case relied on circumstantial evidence that before they died the women suffered severe and unexplained hypoglycemia, a condition normally found in people with diabetes when their blood sugar drops dangerously low.

Campbell’s trial was told he was on the scene at the time of each incident, or in the immediate aftermath, and it was suggested he had injected the patients. All were between the ages of 79 and 88.