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."
More top news
Saturday will be largely cloudy with a continued risk of heavy showers or thunderstorms. Sunday will be dry with sunny spells.
There continues to be a risk of thunder tonight and tomorrow but the weather will become drier and clearer by sunday.
The Chief Exec of car manufacturer Lotus has said he is deeply sorry to announce job losses at the company's head quarters in Norfolk.