Killer and rapist Sean Christian Price has been jailed for life for the 2015 murder of Melbourne teen Masa Vukotic, which a judge says was "at the extremity of brutality".
The man who savagely stabbed the 17-year-old to death as she took an evening walk, then raped a woman in her workplace, will be nearly 70 before he is eligible for release on parole.
Supreme Court Justice Lex Lasry on Friday said he'd tried and failed to understand how a person with a history as violent as Price's could have been released into the community in 2014.
Price was on bail and subject to a 10-year supervision order when he stabbed Ms Vukotic 49 times on March 17 last year before going on a crime spree that culminated in a cruel rape during which he taunted his victim.
A "catastrophic example of mismanagement" allowed him to offend, Justice Lasry said.
"You should never have been left in a position where you could so easily commit these offences as you roamed around the metropolitan area of Melbourne unrestrained and unaccountable."
In jailing the 32-year-old on Friday, Justice Lasry said Price's crimes fell into the worst category because they were planned with care and executed with no remorse or regret.
"The only consequence of the murder of Masa Vukotic you considered was the consequence for yourself," Justice Lasry said.
The day of the murder, Price armed himself with a knife, had the foresight to put a clean T-shirt into his bag and set off in search of someone "affluent" to kill.
He believed it was necessary to stab rich people in order to draw attention to injustices he believed he suffered while in custody.
Price had served a custodial sentence in the Thomas Embling Forensic Hospital for violent sex crimes, and later was jailed for criminal damage and unlawful assault.
Ms Vukotic, an aspiring lawyer, was walking in a park near her Doncaster home when Price saw her.
He later told police: "I just thought f*** this, this is the one."
After seeing media coverage of the murder, Price realised it would only be a matter of time before he was arrested.
On March 19 he attacked a woman at her work, driven by the need for some form of sexual gratification before being arrested.
The woman fought back as Price choked and raped her.
His admissions during his police interview were delivered with an air of "boasting" and performance, Justice Lasry said.
Had Price not pleaded guilty to the offences of murder, rape, robbery and attempted theft, Justice Lasry would not have fixed a minimum term, meaning Price would certainly have died in jail.
Justice Lasry said given Price's history - he was abused as a child - he was unable to exclude an element of mercy.
Price hadn't taken up mental health treatment and was known to have violent tendencies.
"The executive government has both failed to treat you and failed to protect the community," Justice Lasry concluded.
