The family of a 16-year-old Logan girl who has not been seen for two years say they are desperate to find her remains to get closure.
Tiffany Taylor was last seen alive in July 2015 leaving a motel at Waterford West, where she got into a champagne-coloured car.
Police charged Brisbane man Rodney Williams, 60, who they said she met on social media, alleging he murdered Tiffany and dumped her body about 60 kilometres away on the outskirts of Fernvale.
Williams is yet to face trial over the alleged murder.
Despite numerous searches, the teenager's body and her white Samsung Galaxy S5 mobile phone have not been found.
Sister Chloe Taylor said her family had struggled for the last two years, not being able to hold a funeral or say a proper goodbye.
"You go through a million scenarios and it would be nice to have an answer. She can't be out in that big wide world without no-one knowing where she is," she told the ABC.
"I don't care how I find her, I just want to find her."
Ms Taylor described her sister as "independent", and conceded at times her life had gone off track.
But she said Tiffany hoped to have a bright future and was five months pregnant when she went missing.
She said she was close to her sister, and knew something was wrong when Tiffany could not be contacted for a few days.
Police were able to track Williams and Tiffany to the Fernvale area, west of Brisbane, using pings from her phone.
Detective Senior Sergeant Grant Ralston said the phone was then tracked further towards Ipswich at Riverview but was turned off.
He appealed for anyone with information about Tiffany's remains or saw a Hyundai Excel with registration 649VFO to contact Crime Stoppers or Police Link.
