THE Central Queensland duo responsible for murdering a young man through a lethal heroin dose left in a letterbox have had a High Court appeal bid rejected.
Rockhampton pair Bradley David Hill and Kerryn Ann Young were sentenced to life imprisonment after a murder trial in June last year.
Gladstone man Luke McAuliffe was the victim of jealousy, anger and an intent to kill, the Crown argued during the trial.
Hill and Young tried to argue the verdicts were unreasonable but the Queensland Court of Appeal found in a judgment this year there was no miscarriage of justice.
Barrister Soraya Ryan, acting for Hill, said the case was presented as "homicide or nothing" but suggested lesser charges could have applied.
Barrister Peter Callaghan, acting for Young, said the High Court would not get "many clearer examples of error in a Court of Appeal".
But Justice Kenneth Hayne said special leave to appeal was refused.
"There is no reason to doubt the correctness of the actual orders made by the Court of Appeal in these matters," he said.