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Thanks again Eddie and Albaqwerty and others- appreciate your help on this. I very much doubt that anything well ever be proved- the family at the time were very suspicious but did nothing about it, because they didn't want any fuss. However a few years later, the doctor was apparently investigated after doing a similar thing at a nursing home, but the case was dismissed. I have contacted the local newspaper but can find nothing as I have so little to go on. There is every possibility that the doctor has passed away long since too, but the daughter has had years to think about it and wants the GMC or someone to know about her concerns without her getting involved in any criminal proceedings. I expect the subsequent Shipman case flagged up the failings within the system, but it's truly disturbing to think that the practise may have been more widespread than originally thought.
In this case the patient/victim was an elderly man in his eighties who had complained of chest pains and was consigned to sleeping on his sofa at home. On the morning of his death he was clear and lucid in his mind and had conversations with his wife and a visitor. The doctor called and after a brief conversation said, "I will just give you an injection to ease your pain." Both the visitor and the wife were in the room at the time. The doctor held the man's pulse and he was dead within a minute. The doctor showed surprise at the sudden-ness of the death, but said, "his heart was in worse shape than we thought" and was the signatory on the death certificate. It seems bizarre on hindsight, but the man's wife was not suspicious at the time, and although the family were, thought they were over-reacting and it wasn't until the other cases came up years later that their suspicions that he had actually been murdered (or at least helped on his way) came true. The family has sat on this far too long, and so many years have gone past they can't recall the details clearly. It really is just as a favour to help the old lady, and also out of personal interest, as my parents (deceased) also attended the same health centre during those years. I expect I will have to delete these posts as/when I do find out who the doctor was, as the chances of evidence ever making it to court are practically nil, I guess.