Sydney siege gunman's girlfriend jailed for murder of his ex-wife

The girlfriend of Sydney siege gunman Man Haron Monis has been sentenced to at least 33 years in jail for the "hot-blooded and frenzied" murder of his ex-wife.

Amirah Droudis, 37, was in November found guilty of stabbing Monis' 30-year-old ex-wife 18 times, dousing her with petrol and setting her alight at an apartment block in Sydney's west on April 21, 2013.

"There was ample time on the day of the murder for the offender to withdraw from the attack, but she did not do so," Supreme Court Justice Peter Johnson said today.

Droudis appeared calm as the sentence of 44 years in jail with a non-parole period 33 years, was handed down in the NSW Supreme Court at Darlinghurst this morning. 

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Justice Johnson said Droudis' moral culpability in the murder was high and that she had numerous chances to back out of the attack.

He said she and Monis had a very unusual relationship and accepted evidence she suffered emotional and physical abuse at the hands of Monis, whom he described as an "evil man".

"His personality was marked by ... a grandiose sense of self-importance, a lack of empathy and a demonstrated capacity for exploitative behaviour and deceitful conduct," Justice Johnson said.

"He exploited what life in Australia offered him."

The earliest date that Droudis could be eligible for parole is December 22, 2047. 

In handing down his verdict in November, Justice Johnson said it was Monis who orchestrated the attack after a bitter family dispute.

He said Droudis had become "enthralled" by Monis, who took advantage of her willingness to act at his behest.

"This was a hot-blooded and frenzied murder by an enraged female attacker," he said in his judgment.

"This crime had all the hallmarks of a frenzied attack by an angry amateur killer, acting in a manner consistent with Monis' desire."

At Droudis' judge-alone trial, her defence team had suggested the assailant could have been another woman or a hired bikie killer.

But Justice Johnson rejected the theories as fanciful and inconsistent with the evidence.

Monis took 18 hostages in the Sydney siege in December 2014, and he and two hostages were killed.