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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Cloud thickening tonight with rain spreading eastwards later.
A mixture of sunny spells and isolated showers this afternoon.
Police think that one of the men involved in last week's abduction attempt at RAF Marham was given a black eye.