The 45-year-old is set to be sentenced in the Victorian Supreme Court on Friday after a jury in June found him guilty of Maryam Hamka's murder.
Loughnane claimed the 36-year-old died of a drug overdose in the early hours of April 11, 2021, and his only crime was not calling an ambulance.
But the jury rejected that theory, instead accepting the prosecution's case that Loughnane fatally assaulted Ms Hamka with murderous intent.
He then dumped her body in a shallow grave at Cape Schanck in Melbourne's southeast, before leading investigators to her remains in August 2023.
During a November pre-sentence hearing, Loughnane's barrister Daniel Sala said the murder was a drug-fuelled spontaneous attack, lacking aggravating features such as premeditation.
But prosecutor Kristie Churchill said Loughnane had been abusive towards Ms Hamka in the lead-up to the murder and the family violence made the crime more serious.
She conceded Loughnane's decision to bring police to Ms Hamka's remains warranted some discount on sentence, but it was self-serving rather than evidence of remorse.
Ms Hamka's family attended court in November, where they described her death as the hardest thing they have ever been through.
Her brother Ayman Hamka called for "justice to be served" even though he acknowledged no sentence would ever bring his sister back.
Justice Christopher Beale is due to hand down his decision on Friday morning.
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