His modus operandi was to administer a fatal overdose of morphine. It is believed he became fascinated with morphine when it was given to his dying cancer-ridden mother.
Her death devastated him and lead him into medicine. It was his medical title that gave him access to 80-year old Ethel Bennett, his eleventh and last victim of 1988.
He had already killed over 50 of his patients but it would be another decade before the UK’s worst serial killer would be arrested...