Mr Burns said after the murder investigation and the trial, Corporal Johnson asked to be shifted from Roma because he felt unsafe.
“The police superiors agreed, and moved him and his wife Limerick to Longreach, where he served out the rest of his service,” he said.
“[Corporal Johnson] appears in a number of memoirs of retired police who served about that time and was held in very high regard.”
The FQPM said a request to acknowledge Corporal Johnson’s role and resting place had come from Roma-based historian Peter Keegan.
“The scene of the murder at Lethbridge Pocket has been marked with a plaque, and in the middle of all this Corporal Sam Johnson was buried in Longreach and didn’t have a headstone,” Mr Burns said.
“To just round off the whole story and to put some dignity for Sam Johnson, the Friends of the Museum decided to seek some assistance and the Queensland Police Union and the Queensland Police Service have assisted us to do this.”
The plaque is being dedicated at 9:00am on Tuesday at the Longreach Cemetery, ahead of a service for Police Remembrance Day in the memorial garden at the Australian Stockman’s Hall of Fame.