Murderers and people who are accessories to a death will now have to tell police the location of their victims if they want to be released on parole, after so-called "No Body No Parole" laws passed the Queensland parliament.
The laws ensure closure for the families of victims and force killers to serve their full term if they don't identify the location of any remains.
Members of two families affected by the laws, the Pullen family and the Splitt family, watched the passage of the legislation from the public gallery on Thursday, and applauded when it was passed.
Fiona Splitt from Cooktown in far north Queensland has been fighting for a version of the laws since her husband Bruce Schuler was murdered in 2012, with his remains never found.
Gary and Leanne Pullen's son Tim was also murdered in 2012, with one of the men responsible for his death spending only a little more than a year behind bars.
Ms Splitt started a petition to get the laws passed and said the legislation was a victory for all victims of crime in search of closure.
"It will help a lot of people in Queensland, if criminals tell them where the bodies are," she told reporters on Thursday.
Ms Pullen agreed, saying the laws had the potential to avoid more heartache.
"I know that this legislation isn't necessarily going to make all perpetrators talk... but surely it has to be a huge incentive, the thought of having no parole, to disclose what they've done," she said.
Attorney-General Yvette D'Ath said the measures were retrospective, meaning anyone currently in jail for murder who becomes eligible for parole but hasn't revealed the location of their victim's body won't be released until they do.
Ms D'Ath said the definition of "murder" relating to the parole law had been expanded to include accessory charges to all the major offences.
"So it's quite a broad definition but by extending it to accessory after the fact and particularly in relation to manslaughter, means our legislation will be broader than any other jurisdiction," she said.