Harriet Wran came from a wealthy well-known family, grew up with a loving father and went to some of Sydney's most exclusive private schools.
Her new boyfriend and his mate led much less privileged lives, being expelled from school in year seven, having troubled relationships with their fathers and difficult childhoods.
But drug addictions bought the trio together, culminating in the murder of small-time dealer Daniel McNulty in his squalid inner-Sydney housing commission flat in August 2014.
On Thursday, Justice Ian Harrison jailed Wran's former boyfriend Michael Lee, 37, for at least 13 years and six months for the "senseless" stabbing murder.
Lloyd Edward Haines, 31, who knew Lee had a knife but did not anticipate it would be used, was jailed for at least 11 years.
They both pleaded guilty in the NSW Supreme Court to murder and armed robbery with wounding of Mr McNulty's flatmate, Brett Fitzgerald.
Their sentencing comes a fortnight after Wran, 28, was released from jail after serving her two-year minimum term for being an accessory after the fact of murder and robbery.
The daughter of former NSW premier Neville Wran pleaded for privacy in her ongoing struggle to overcome her ice addiction, asking reporters to "understand that I'm still very much in recovery".
The trio went to the unit to get drugs and spontaneously decided to rob Mr McNulty which led to a violent struggle between the occupants and Lee and Haines.
The robbery "escalated unexpectedly and quickly in a manner that neither offender anticipated or foresaw", the judge said.
When jailing Wran in July, Justice Harrison said it was unlikely she would ever have been caught up in the events that night if she had not suffered from mental illness, including a long-running battle with bulimia and drug addiction.
On Thursday, he noted Lee's long criminal and drug history.
In his letter to the court, Lee said: "Sadly your honour drugs have had a hold over me for so long which has ruined my life and I'm just sorry that I didn't wake up to myself sooner and changed my life".
Haines, who also has a history of substance abuse and mental impairments, said he was ashamed and sorry, adding "the only excuse I have for my actions is that my mind was clouded by the drug ice".
The judge set a maximum of 17 years and six months for Lee and 14 years and eight months for Haines, also adding time for the wounding offence.
