When did the suspected serial killer to which John B. Harman was notable as a medical expert witness for his defence died? 
John B. Harman:  He was also notable as a medical expert witness for the defence in the trial of suspected serial killer John Bodkin Adams. John Bodkin Adams: John Bodkin Adams (21 January 1899 – 4 July 1983) was a British general practitioner, convicted fraudster and suspected serial killer.
4 July 1983