It is nearly thirty years since ten-year-old Sarah Harper was snatched from the street near her home in Brunswick Place in Morley, bundled into a van and murdered.
Sarah had simply been running an errand to the corner shop when she disappeared.
Her body was found in the River Trent near Nottingham three weeks later.
Van driver Robert Black was jailed for her murder - and the murders of three other young girls, five-year- old Caroline Hogg, 11-year-old Susan Maxwell and Jennifer Cardy who was nine .
One investigative journalist who has examined his offending in detail says he may have killed eight young girls - and possibly more abroad.
One crime Black was suspected of was the murder of 13-year-old Genette Tate in Devon in 1978. She disappeared while delivering newspapers. Her body has never been found. Police said after 38 years they finally had enough evidence to bring a case against Black and were due to present a file to prosecutors next month.
Today Genette's father revealed he had been trying to make contact with Black.
Police used petrol receipts to track Black's movements around the country He never acknowledged his crimes. One detective, now retired, who worked on the Sarah Harper inquiry says Black died without revealing the full extent of his evil.
For Sarah Harper's grandmother Marlene the pain of her loss will never go away. She did not want to speak on camera today but told ITV Calendar the death of Robert Black was quite simply the best news she had ever had.