A Melbourne ice user who murdered his girlfriend's baby boy in a "ferocious, brutal and sickening attack" has been jailed for 34 years, it can now be revealed.
Dwayne Lindsey, 35, killed six-month-old Chayse Dearing at a home in Glenroy in June 2016 while the child's mother Michelle was out shopping.
He launched the fatal and unexplained assault after using ice and having not slept in days.
Lindsey was later found guilty by a Supreme Court jury of murder and jailed in May for 34 years with a non-parole period of 27 years.
Justice Stephen Kaye said the "vicious and violent" attack left Chayse with catastrophic head injuries and many wounds to his face and body.
"Those injuries in combination bear the hallmarks of a ferocious, brutal and sickening attack inflicted by you on a defenceless, harmless and innocent baby," the judge said, when jailing Lindsey.
But these facts and the sentence could not be reported until Friday, when a County Court judge lifted a non-publication order.
The suppression order was in place because Lindsey was charged with assaulting another victim and a fair trial needed to be ensured. Prosecutors discontinued that case on Friday.
Chayse's mother Michelle started a relationship with Lindsey about four months before the murder.
Justice Kaye said there was no evidence about why Lindsey killed the child, and found this "disturbing".
"The neighbour did not hear any crying or any other noise from the baby that might have provoked or irritated you beyond the limits of your patience," he said.
"In those circumstances, it is most disturbing that there is no explanation for your conduct."
Lindsey told his girlfriend and authorities he had fallen asleep with Chayse on his chest and then awoke with a startle, believing there was a spider on him.
He claimed he jolted and Chayse fell onto the heater or floor and then panicked and caused the other injuries as he tried to revive the child.
The jury rejected his version and convicted him of murder.
Chayse's mother Michelle said she was "destroyed" by the loss of her "little sweet boy".
"I miss more and more every day his smile, his cheeky laugh, the way he looked at me with so much love," she said in her victim statement.
Paramedics responding to the emergency were also deeply affected by the injuries Chayse suffered, the judge said.
Justice Kaye said a strong sentence was needed to reflect the importance of protecting children and deterring others from harming them.
"Conduct of the type in which you engaged will be met with the most severe of sentences, in which mercy plays no role," he said.
"It is only in that way that this court can do its best to protect the lives of the young and vulnerable members of our society."