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In 2015, investigative journalist Time Tate and intelligence expert Chris Clark published a book, claiming the ripper had got away with 23 unsolved murders.
The book prompted police to launch a cold-case review.
He was also convicted of attempting to murder seven others.
Over five years in the 1970s the serial killer committed a string of offences, involving knives, hammers and screwdrivers.
Another possible victim is Tracy Browne, who was 14 when she was hit with a hammer in Silsden, West Yorkshire.