Anna Kenny, Hilda McAulay and Agnes Cooney. You might not recognise these names. All three were killed in Glasgow in 1977; the same year that Helen Scott and Christine Eadie were murdered in Edinburgh, after leaving the World's End pub.

In last year's BBC Radio Scotland series 'The Long Shadow at the World's End', Edi Stark told the story of the Edinburgh investigation, following the case over 37 years until it's eventual conclusion in 2014.

By this time Sinclair had a history of murder, rape and sexual assault.

He's now convicted of four deaths: the culpable homicide of Catherine Reehill in 1961. In 1982 he was charged with 13 sexual assaults on young girls across Glasgow and sentenced to thirty years. His DNA linked later him to the murder of Mary Gallagher in 1978, after police carried out a cold case review in 2001.

While Angus Sinclair was found guilty of all these crimes, the cases of Anna Kenny, Hilda McAulay and Agnes Cooney have never been solved.

Detectives have long suspected that Sinclair killed all five women in 1977. Forensic pathologists at the University of Glasgow even concluded that there were "striking similarities" linking each case.

But the evidence uncovered by the 2004 police re-investigation was not enough to convince the Crown Office to take forward the five murders as one case.

Detectives in Strathclyde were furious and have questioned why Sinclair was not tried for these cases.

In part two of The Forgotten Women, Edi Stark speaks with detectives about a complex case.

Almost four decades on can the killer ever be brought to justice? Show less