HOMICIDE detectives believe an anonymous call to Crime Stoppers may be key to their investigation into the cold case murders of Barbara McCulkin and her daughters.
Torbanlea man Gary "Shorty" Dubois and his former associate Vincent O'Dempsey are before the courts charged with the kidnapping murders of Barbara, Leanne and Vicki more than 40 years ago.
The pair was arrested eight months after an inquest into cold case murders began this year.
Fresh information was allegedly passed on to operators last Wednesday and police are appealing for the caller to once again come forward.
Speaking to reporters in Brisbane on Friday, Detective Inspector Mick Dowie said while he could not divulge details about the information provided, it was of "considerable interest" to police.
"We are hopeful this person will again contact Crime Stoppers or the Homicide Group," he said
"The caller's identity can be protected - we just need to speak to them about their information."
Barbara and her daughters disappeared from their Highgate Hill home in 1974. Their bodies have never been found.
O'Dempsey, 76, and Dubois, 67, were arrested in Brisbane last month.
Police will allege the women were killed because they had information about the 1973 fire at the Whiskey Au Go Go nightclub which claimed 12 lives in Brisbane's Fortitude Valley.
Anyone with information can phone Crime Stoppers on 1800 333 000.