A woman has been sentenced to 28 years in prison for the 2005 murder of her de facto partner George Templeton — the second time she has been jailed for murdering a lover.

Key points: Robyn Lindholm is already serving a 25-year sentence for her involvement in a former partner's death

Robyn Lindholm is already serving a 25-year sentence for her involvement in a former partner's death She "engaged in a deliberate and projected deception" after Mr Templeton disappeared, a judge said

She "engaged in a deliberate and projected deception" after Mr Templeton disappeared, a judge said She won't be eligible for parole until she is 71

In September, a jury found Robyn Lindholm, 46, guilty of the murder of her partner George Templeton, also known as George Teazis, who went missing in May 2005.

Although the former stripper had an alibi for the night Mr Templeton went missing, because she was not at their home in Melbourne's northern suburbs at the time, the jury found her guilty.

Lindholm is already serving a 25-year jail term for her involvement in the death of another partner, Wayne Amey, in 2013.

The court heard Mr Templeton had been drinking the night before his death to mark the anniversary of his father's passing.

"By late that night George was drunk, possibly stoned and certainly vulnerable," Supreme Court Justice Christopher Beale said.

"George was gone, there was no sign of a break-in — he just disappeared."

Mr Templeton, also known as George Teazis, went missing in May 2005. ( Supplied )

The court heard Lindholm and Mr Amey lived in an expensive home in Hawthorn after Mr Templeton's death.

"You were living the high life at the expense of your former de facto's life."

Fourteen years of the sentence handed down on Thursday will be served concurrently with the previous sentence.

Lindholm was given a new non-parole period of 30 years, meaning she will not be eligible for parole until she is 71.

'Brutal, traumatic and horrifying'

Mr Templeton was a father of five who ran a carpet-laying contracting business and had been in a relationship with Lindholm for seven years.

His body was never found.

During a plea hearing last month, prosecutor Ray Gibson told the court there were a number of aggravating factors contributing to Lindholm's crime, including the fact that she "misled" police and Mr Templeton's family when she "engaged in a deliberate and projected deception" about his disappearance.

"That the family had to live with the 'mystery' surrounding his death for over 25 years [caused] … considerable stress and heartache," Mr Gibson said.

George Templeton's sister-in-law Deborah Teazis read a statement to the court during the plea hearing.

"We've lost a brother, a father, a son and a friend in the most brutal, traumatic and horrifying manner," she said.

His brother, Nick Teazis, worked with Mr Templeton in the family business, and spoke of his loss in a victim impact statement submitted to the court.

"Him not being by my side has left a big void in my heart. I can still remember his laughter, the last thing I heard come from him," he said.

While prosecutors could not be certain exactly how Mr Templeton died, forensic specialists found his blood in the home he shared with Lindholm in suburban Reservoir.

Lindholm blamed lover for Templeton's death

The court heard Lindholm had claimed Mr Templeton was a violent and jealous man.

Lindholm maintained she was innocent and had no involvement in Mr Templeton's death or disappearance.

She pointed the finger at Mr Amey.

Lindholm's other partner, Wayne Amey, was killed at his apartment block 2013. ( Supplied )

She had started an affair with him when Mr Templeton was in jail in 2003.

Justice Beale referred to an entry in Lindholm's diary, dated May 3, 2005 — the day Mr Templeton disappeared.

The diary entry included hand-drawn love hearts with arrows through them and the name Batman, which was her pet name for Amey — a reference to superhero Batman and his sidekick, which shared her first name.

Mr Gibson described Mr Amey's death as a "horrific and planned killing" prompted by a dispute over property.

In that case, Lindholm coaxed others into carrying out the actual murder.

The suffering continues for Mr Templeton's family.

During the plea hearing, the court heard his 83-year-old mother — who lives in Greece — still does not know the full details of his death.

The family still has questions.

"If we, as a family, could ask for anything, it is to know what happened to George and where his body lies," Deborah Teazis said last month.

"We ask to let us have him home and let us lay him to rest."