Eric Wilson said he was disappointed Queensland Coroner Michael Barnes could not find enough evidence to bring somebody to trial for the murder of his sister, Lorraine, and Wendy Evans, who disappeared in 1974 while on a holiday.

But he took some consolation from somebody being named as culprit.

The coroner found at the inquest on Friday a man with a "proclivity" for rape murdered the two nurses in southern Queensland in 1974.

That man, Wayne "Boogie" Hilton, died in a car crash in the 1986 - a decade after the women's bodies were found in bushland at Murphy's Creek, near Toowoomba.

They had died from head wounds inflicted by, or in the presence of, Hilton, Mr Barnes found.

While it was very likely they'd been the victims of a gang attack, the coroner said there was not enough evidence to pursue charges against anyone else.

During the recent inquest into the women's deaths, suspicions were raised about others, including Allan 'Shortie' Laurie, Allan 'Ungie' Laurie and other members of the Laurie and Hilton families.

Mr Barnes said he could only lay responsibility at the feet of Wayne "Boogie" Hilton, but was certain he had not acted alone.

He added: "It is more likely than not Wendy Evans and Lorraine Wilson tragically stumbled into this putrid pool of miscreants and were killed by them."

Mr Barnes found it was unlikely Ms Wilson, 20, and Ms Evans, 18, had been raped before they were murdered, dismissing the accounts of several witnesses to the inquest.

The coroner spoke too of what might have been if witnesses who saw the hitchhiking women in trouble had stopped to help them.

"Alarmingly a number of people drove by the incident on the Toowoomba Range ignoring the women's frantic pleas when it must have been obvious they were in grave danger," Mr Barnes said.

"With the failure of any of those people to even attempt to intervene went the girls' last chance of survival."

In laying blame on Hilton, Mr Barnes said witness sightings of him that night, his "proclivity" for rape, a confession and other admissions were enough to implicate him in the girls' murders.

"Undoubtedly, they were abducted and killed by more than one person but the identity of those responsible can not be established with sufficient certainty, with one exception: namely, Wayne Robert Hilton," he said.

Mr Wilson said he didn't know if he would ever have closure, but he took some comfort from the fact the inquest had shone a light on what had happened that night on the Toowoomba Range.

"It's good that somebody's been named... I suppose they've all been named now on the public record in a way," he said.

"... I would have wanted to see somebody held accountable, really badly."

He was accompanied outside the court by his cousin, Penny Allen, who said she had a message for the murderers, those involved and the people with "conveniently failed memories".

"You are all cowards, the whole lot of you, cowards," she said.

"Murder itself is a ghastly, ghastly act and therefore your conscience must be filled with guilt, a taunted past and no pity.

"No one will save you from punishment . . . you can not take Wendy and Lorraine's innocence, hopes, dreams, youth and family away and not be judged.

"Your day will come."