It's been 20 years since a notorious bikie boss vanished without trace and police are calling for gang members to break ranks and help deliver justice.
Former Gypsy Joker president Steve Williams was last seen on June 14, 2005 at Gepps Cross Hotel in Adelaide.
The then 38-year-old worked as a debt collector and had told his mum he was going to the pub to meet someone he knew.
Thanks to a call to Crime Stoppers in 2005, police believe Mr Williams was later dropped at a trucking company in Gillman by an associate - most likely to collect money from someone who worked there.
His white Ford Falcon was later found abandoned in the hotel car park.
Despite his body never being found, it is believed Mr Williams was murdered.
On Saturday, two decades since his disappearance, police believe his murder can be solved.
Detective Sergeant Paul Ward said despite a code of silence adhered to by outlaw motorcycle gang members investigators had previously received some information about his disappearance.
However there were still people out there they hadn't spoken to who knew exactly what had happened.
"Over the last 20 years, friendships and loyalties may have changed," he said.
"People are 20 years older, they may now have children of their own."
Sgt Ward asked anyone withholding details to put themselves the position of Mr Williams' daughter, Blayze, who had grown up not knowing what happened to her father.
"For the sake of the Steven Williams' family, if you have information, please contact Crime Stoppers and help find his remains and bring him home to his family," he said.
Somewhat of a celebrity in South Australia, Mr Williams became a media-friendly face of the usually secretive bikie world and outlaw motorcycle club that he led.
Despite speculation about his gruesome demise, which has almost become folklore in South Australia, none of the stories have led investigators to his body.
Blayze Williams, who was only 13 when her dad went missing, has previously said she also believes he was murdered.
"It's time - just come forward and give us a break from it all," she told 7News on Friday.
"I'd like to spend one part of my life without worrying and actually knowing the answers.
"Just give us a break and let there be an end to this. Let us finish it all and everyone can be rested."
She maintained that despite his criminal links, her father was a kind, caring soul.
A $200,000 reward is still on offer for information leading to a conviction or the recovery of Mr Williams' remains.
