A man has been arrested and charged over a cold case triple murder at Spear Creek, near Mount Isa in north-west Queensland.
Karen Edwards, Tim Thomson and Gordon Twaddle were found shot dead in bushland, 10 kilometres north of Mount Isa, in October, 1978.
The three had last been seen on the morning of October 5 following their arrival in Mt Isa as part of a motorcycle journey from Alice Springs to Melbourne.
A post-mortem examination showed they died from a gunshot wound to the head, fired from a .22 calibre rifle.
The Homicide Cold Case Investigation Team charged the 63-year-old Goulburn man with three counts of murder on Friday.
Police renewed their investigation last month, with a $250,000 reward still on offer for any information which leads to a conviction.
Further, an indemnity from prosecution remains in place for any accomplice who first gives information to police.
More to come.
The Moondarra Caravan Park in Mount Isa where Gordon Twaddle, Karen Edwards, and Tim Thomson were last seen on the morning of Thursday, October 5. They were later found shot dead. (Supplied: Queensland Police)