Senior Investigating Officer, Detective Chief Inspector Paul Durham said: “We are investigating an allegation that a drugs overdose was administered to a patient, leading to his death.
“A Home Office post-mortem, carried out earlier this week, determined the cause of Mr May’s death as heart failure and we now await the results of further toxicology tests which will help inform our inquiry."
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The RSPCA is appealing for help to find the people responsible for dumping two poorly foals in a field in Cambridgeshire.
Protesters chained themselves together on a runway at Stansted Airport in an attempt to stop a charter flight taking off.