THREE people, including a 16-year-old girl, are facing murder charges in relation to missing Ipswich man Shaune Gibson.
The 19-year-old Booval man disappeared six weeks ago and police believe a body found in a roadside grave at Churchable, 21km north of Gatton, could be that of Mr Gibson.
Police arrived at the Balaam Hill Rd, a rural dirt road off Gatton-Esk Rd, early on Saturday morning.
The discovery came after murder charges were laid against the trio, all from Eastern Heights, and another man charged with accessory after the fact.
It is hoped a post mortem, to be conducted this morning, will determine if the human remains found near Gatton are those of the missing 19-year-old.
Forensic police scoured the gravesite and a home in Cooinda St, Eastern Heights, over the weekend.
The home is believed to be the residence of a 45-year-old woman and 16-year-old girl charged with murder.
Neighbours of the Cooinda St home said the residents kept to themselves and were rarely heard from.
A 27-year-old man was also charged with murder and interfering with a corpse, and a 25-year-old man was charged with accessory to murder after the fact.
Mr Gibson was last seen leaving his sister's Booval home on August 9.
Detective Senior Sergeant Gary Dixon said police began investigating the disappearance of Mr Gibson when he was reported missing by his sister last month.
He said Mr Gibson's family had been kept up to date with the police investigation.
"We have been in contact with the family of the missing person. However, he has not been identified as yet," he said.
The four suspects appeared in Ipswich Magistrate Court on Saturday morning and were refused bail.
They will next appear in court on Wednesday.
The Gibson and Scott families thanked the Queensland Police Service for their investigation into Mr Gibson's disappearance, via social media yesterday.
"He (Mr Gibson) will be sadly missed, but not forgotten by those who knew him. This is such a horrible tragedy and we hope that no-one would ever have to endure this in their lives," the message read.
Family and friends of Mr Gibson's family began to leave tributes on social media sites after murder charges were laid.
One tribute read: "Hey Shaune - May u rest with the Angels in Heaven Matey. It was a pleasure being your Uncle and Boxing Trainer. We will miss u forever - sweet dreams & till we meet again. Love u mate - RIP Champ Love Uncle Gordie, Aunty Jo & your Cuz's xo xo xo xo".
Another read: "May u rest in peace shaune I knew u as a little fella and always remember u smiling and that is how I will always remember u my heart goes out to Andrew and ros and there family.. May god keep u safe mate."
August 9: Shaune Gibson last seen leaving his sister's home in Booval.
August 28: Mr Gibson's family report the 19-year-old missing to police after not hearing from him for three weeks.
Police begin investigating Mr Gibson's disappearance.
September 21: Ipswich police charge three people from Eastern Heights with murder, including a 16-year-old girl, and a fourth person with accessory to murder after the fact.
September 22: The four accused appear in a brief Ipswich Magistrates Court hearing. They are refused bail.
A body is found in a roadside grave at Churchable, believed to be Mr Gibson, but is yet to be identified.
Today: A post-mortem examination is expected to determine the identity of human remains found in Churchable.